Re: [tor-bugs] #23745 [Applications/Tor Browser]: Tab crashes when using Tor Browser to access Google Drive

[Tor Bug Tracker & Wiki]

#23745: Tab crashes when using Tor Browser to access Google Drive
-+-
 Reporter:  angelotheram2|  Owner:  tbb-
 |  team
 Type:  defect   | Status:  closed
 Priority:  Medium   |  Milestone:
Component:  Applications/Tor Browser |Version:
 Severity:  Major| Resolution:  fixed
 Keywords:  tbb-crash, tbb-7.0-issues, tbb-  |  Actual Points:
  regression, tbb-e10s, TorBrowserTeam201810R|
Parent ID:   | Points:
 Reviewer:   |Sponsor:
-+-
Changes (by gk):

 * status:  needs_review => closed
 * resolution:   => fixed


Comment:

 We are done here. We should open a new ticket if we still think that's
 necessary. FWIW: IndexedDB FPI got implemented in
 https://bugzilla.mozilla.org/show_bug.cgi?id=1278037 which has a test.

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Re: [tor-bugs] #23745 [Applications/Tor Browser]: Tab crashes when using Tor Browser to access Google Drive

[Tor Bug Tracker & Wiki]

#23745: Tab crashes when using Tor Browser to access Google Drive
-+-
 Reporter:  angelotheram2|  Owner:  tbb-
 |  team
 Type:  defect   | Status:
 |  needs_review
 Priority:  High |  Milestone:
Component:  Applications/Tor Browser |Version:
 Severity:  Major| Resolution:
 Keywords:  tbb-crash, tbb-7.0-issues, tbb-  |  Actual Points:
  regression, tbb-e10s, TorBrowserTeam201711R|
Parent ID:   | Points:
 Reviewer:   |Sponsor:
-+-

Comment (by angelotheram2):

 All,
 I just downloaded and ran Tails 3.3, with Tor Browser 7.0.10, and Google
 Drive is now working for me without any about:config changes in Firefox.
 Thank you for the fix.

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Re: [tor-bugs] #23745 [Applications/Tor Browser]: Tab crashes when using Tor Browser to access Google Drive

[Tor Bug Tracker & Wiki]

#23745: Tab crashes when using Tor Browser to access Google Drive
-+-
 Reporter:  angelotheram2|  Owner:  tbb-
 |  team
 Type:  defect   | Status:
 |  needs_review
 Priority:  High |  Milestone:
Component:  Applications/Tor Browser |Version:
 Severity:  Major| Resolution:
 Keywords:  tbb-crash, tbb-7.0-issues, tbb-  |  Actual Points:
  regression, tbb-e10s, TorBrowserTeam201710R|
Parent ID:   | Points:
 Reviewer:   |Sponsor:
-+-

Comment (by gk):

 Looks good to me. Applied to `tor-browser-52.4.0esr-7.5-1` (commits
 03d6c603319adbf80c6a9badc0922fd339fb80cc and
 b4fc15a8986a8d2c8267df281b526eafb58bf6d7).

 The patches are straight forward so I applied them as well to `tor-
 browser-52.4.0esr-7.0-1` to get the crash fixed in 7.0.7 as well (commits
 d3222cf5469b28bfb2b018055693d94254df9cd2 and
 00c8f9b86215e26a2a9785be4a45e8a2d652e224).

 Please test the FPI, though. We might have time to revert things in the
 unlikely case FPI is broken. Leaving the ticket open for that part.

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Re: [tor-bugs] #23745 [Applications/Tor Browser]: Tab crashes when using Tor Browser to access Google Drive

[Tor Bug Tracker & Wiki]

#23745: Tab crashes when using Tor Browser to access Google Drive
-+-
 Reporter:  angelotheram2|  Owner:  tbb-
 |  team
 Type:  defect   | Status:
 |  needs_review
 Priority:  High |  Milestone:
Component:  Applications/Tor Browser |Version:
 Severity:  Major| Resolution:
 Keywords:  tbb-crash, tbb-7.0-issues, tbb-  |  Actual Points:
  regression, tbb-e10s, TorBrowserTeam201710R|
Parent ID:   | Points:
 Reviewer:   |Sponsor:
-+-
Changes (by arthuredelstein):

 * status:  assigned => needs_review
 * keywords:
 tbb-crash, tbb-7.0-issues, tbb-regression, tbb-e10s,
 TorBrowserTeam201710
 =>
 tbb-crash, tbb-7.0-issues, tbb-regression, tbb-e10s,
 TorBrowserTeam201710R


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Re: [tor-bugs] #23745 [Applications/Tor Browser]: Tab crashes when using Tor Browser to access Google Drive

[Tor Bug Tracker & Wiki]

#23745: Tab crashes when using Tor Browser to access Google Drive
-+-
 Reporter:  angelotheram2|  Owner:  tbb-
 |  team
 Type:  defect   | Status:
 |  assigned
 Priority:  High |  Milestone:
Component:  Applications/Tor Browser |Version:
 Severity:  Major| Resolution:
 Keywords:  tbb-crash, tbb-7.0-issues, tbb-  |  Actual Points:
  regression, tbb-e10s, TorBrowserTeam201710 |
Parent ID:   | Points:
 Reviewer:   |Sponsor:
-+-

Comment (by arthuredelstein):

 Replying to [comment:10 gk]:
 > Another thought I had: it might be a good idea to take the old Tor
 Browser version Mike used back then for testing where he realized that
 IndexedDB related data is not getting deleted on `New Identity`. Just to
 be sure we are testing the same thing and it is indeed fixed now but not
 in the old Tor Browser.

 Good idea. I tested the indexedDB demo at
 https://codepen.io/caraya/pen/xVrXrG
 with "browser.privatebrowsing.autostart" set to false
 using our build at
 https://archive.torproject.org/tor-package-archive/torbrowser/5.0a3/tor-
 browser-linux64-5.0a3_en-US.tar.xz
 which is the same TBB version that was available when Mike posted
 ticket:16528#comment:11.

 I confirmed that New Identity does not clear the indexedDB database in
 that version.

 I also re-ran the experiment in comment:8 and confirmed that New Identity
 clears indexedDB in the latest Tor Browser.

 So here are two patches for review: https://github.com/arthuredelstein
 /tor-browser/commits/23745

 Although I could see evidence of FPI in comment:8, I haven't directly
 observed it. I will write code to test that tomorrow. I'm pretty confident
 FPI is happening, though, given the filenames I observed and also by
 confirmation from Mozilla folks, so if there isn't time to wait for that
 test, I would suggest trying it in the alpha anyway.

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Re: [tor-bugs] #23745 [Applications/Tor Browser]: Tab crashes when using Tor Browser to access Google Drive

[Tor Bug Tracker & Wiki]

#23745: Tab crashes when using Tor Browser to access Google Drive
-+-
 Reporter:  angelotheram2|  Owner:  tbb-
 |  team
 Type:  defect   | Status:
 |  assigned
 Priority:  High |  Milestone:
Component:  Applications/Tor Browser |Version:
 Severity:  Major| Resolution:
 Keywords:  tbb-crash, tbb-7.0-issues, tbb-  |  Actual Points:
  regression, tbb-e10s, TorBrowserTeam201710 |
Parent ID:   | Points:
 Reviewer:   |Sponsor:
-+-

Comment (by gk):

 Another thought I had: it might be a good idea to take the old Tor Browser
 version Mike used back then for testing where he realized that IndexedDB
 related data is not getting deleted on `New Identity`. Just to be sure we
 are testing the same thing and it is indeed fixed now but not in the old
 Tor Browser.

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Re: [tor-bugs] #23745 [Applications/Tor Browser]: Tab crashes when using Tor Browser to access Google Drive

[Tor Bug Tracker & Wiki]

#23745: Tab crashes when using Tor Browser to access Google Drive
-+-
 Reporter:  angelotheram2|  Owner:  tbb-
 |  team
 Type:  defect   | Status:
 |  assigned
 Priority:  High |  Milestone:
Component:  Applications/Tor Browser |Version:
 Severity:  Major| Resolution:
 Keywords:  tbb-crash, tbb-7.0-issues, tbb-  |  Actual Points:
  regression, tbb-e10s, TorBrowserTeam201710 |
Parent ID:   | Points:
 Reviewer:   |Sponsor:
-+-

Comment (by gk):

 Replying to [comment:8 arthuredelstein]:
 > So to me it looks like FPI and clearing on New Identity mean that non-
 PBM indexedDB functionality is already the way we want it in Tor Browser,
 even when dom.indexedDB.enabled = true. And of course PBM windows already
 disabled indexedDB. So I'm inclined to do a little more testing to confirm
 FPI of indexedDB. If nothing bad is found, I would suggest we simply
 revert our #21308 patch, flip the "dom.indexedDB.enabled" pref to true and
 call that a fix for this ticket. gk, what do you think?

 Sounds like a plan. Thanks for digging up all that useful info.

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Re: [tor-bugs] #23745 [Applications/Tor Browser]: Tab crashes when using Tor Browser to access Google Drive

[Tor Bug Tracker & Wiki]

#23745: Tab crashes when using Tor Browser to access Google Drive
-+-
 Reporter:  angelotheram2|  Owner:  tbb-
 |  team
 Type:  defect   | Status:
 |  assigned
 Priority:  High |  Milestone:
Component:  Applications/Tor Browser |Version:
 Severity:  Major| Resolution:
 Keywords:  tbb-crash, tbb-7.0-issues, tbb-  |  Actual Points:
  regression, tbb-e10s, TorBrowserTeam201710 |
Parent ID:   | Points:
 Reviewer:   |Sponsor:
-+-

Comment (by arthuredelstein):

 Replying to [comment:6 gk]:

 > And I think that is good. Getting a clean slate should not depend on
 whether you are in PBM or are allowing disk records for some reason.

 OK, I'm persuaded it's a good idea. Thanks!

 Replying to [comment:5 arthuredelstein]:

 > * indexedDB is a supercookie vector and has not yet been patched to
 respect first-party isolation in Tor Browser or Firefox.
 > * As [https://trac.torproject.org/projects/tor/ticket/16528#comment:7
 mikperry pointed out], there wasn't a good way to programmatically clear
 indexedDB databases. That issue may have been recently fixed in
 [https://bugzilla.mozilla.org/show_bug.cgi?id=1047098 Firefox] and we
 should investigate if we can use this in New Identity.

 I was behind the curve and learned in fact both these problems have
 already been solved:
 * New Identity does appear to wipe indexedDB.
 * indexedDB is first-party isolated in ESR52 (and TBB/ESR52).

 To confirm these two assertions, I did the following experiment:
 1. I set "browser.privatebrowsing.autostart" to false and
 "dom.indexedDB.enabled" to true in Tor Browser 7.0.6.
 2. I opened a New non-PB window and visited
 https://codepen.io/caraya/pen/xVrXrG which allows one to make entries in
 an indexedDB database. I manually entered 3 entries.
 3. I saw in `tor-browser_en-
 US/Browser/TorBrowser/Data/Browser/profile.default/storage/default` that
 there was a directory called
 `https+++s.codepen.io^firstPartyDomain=codepen.io/`.
 4. I restarted Tor Browser, visited the site again and confirmed that my
 database entries were still present.
 5. I clicked "New Identity", visited site once more and saw the the
 database was now reported empty.
 6. I noted that `tor-browser_en-
 US/Browser/TorBrowser/Data/Browser/profile.default/storage/` had been
 deleted, including its subdirectories
 `default/https+++s.codepen.io^firstPartyDomain=codepen.io/`

 FPI of indexedDB was also
 [https://bugzilla.mozilla.org/show_bug.cgi?id=1405884 confirmed to me by a
 few Mozillians]. And I noticed that code in torbutton here:
 
https://gitweb.torproject.org/torbutton.git/tree/src/chrome/content/torbutton.js?id=b3ff9863db338b2bd612f109e8bbce4c4af7cbd0#n348
 is likely where the indexedDB wiping is happening. (It might be good to
 update that code to better resemble this Mozilla patch here:
 https://hg.mozilla.org/mozilla-central/rev/0fbe00ad0203#l1.42
 because it doesn't require turning on the "dom.quotaManager.testing" pref;
 I will make a note in #23768.)

 So to me it looks like FPI and clearing on New Identity mean that non-PBM
 indexedDB functionality is already the way we want it in Tor Browser, even
 when dom.indexedDB.enabled = true. And of course PBM windows already
 disabled indexedDB. So I'm inclined to do a little more testing to confirm
 FPI of indexedDB. If nothing bad is found, I would suggest we simply
 revert our #21308 patch, flip the "dom.indexedDB.enabled" pref to true and
 call that a fix for this ticket. gk, what do you think?

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Re: [tor-bugs] #23745 [Applications/Tor Browser]: Tab crashes when using Tor Browser to access Google Drive

[Tor Bug Tracker & Wiki]

#23745: Tab crashes when using Tor Browser to access Google Drive
-+-
 Reporter:  angelotheram2|  Owner:  tbb-
 |  team
 Type:  defect   | Status:
 |  assigned
 Priority:  High |  Milestone:
Component:  Applications/Tor Browser |Version:
 Severity:  Major| Resolution:
 Keywords:  tbb-crash, tbb-7.0-issues, tbb-  |  Actual Points:
  regression, tbb-e10s, TorBrowserTeam201710 |
Parent ID:   | Points:
 Reviewer:   |Sponsor:
-+-
Changes (by gk):

 * keywords:  tbb-crash, tbb-e10s, TorBrowserTeam201710 =>
 tbb-crash, tbb-7.0-issues, tbb-regression, tbb-e10s,
 TorBrowserTeam201710


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Re: [tor-bugs] #23745 [Applications/Tor Browser]: Tab crashes when using Tor Browser to access Google Drive

[Tor Bug Tracker & Wiki]

#23745: Tab crashes when using Tor Browser to access Google Drive
-+-
 Reporter:  angelotheram2|  Owner:  tbb-
 |  team
 Type:  defect   | Status:
 |  assigned
 Priority:  High |  Milestone:
Component:  Applications/Tor Browser |Version:
 Severity:  Major| Resolution:
 Keywords:  tbb-crash, tbb-e10s, |  Actual Points:
  TorBrowserTeam201710   |
Parent ID:   | Points:
 Reviewer:   |Sponsor:
-+-

Comment (by gk):

 Replying to [comment:5 arthuredelstein]:
 > There was a concern that some users might disable PBM and then New
 Identity would fail to wipe indexedDB. Do we actually want to claim to
 protect users who turn off PBM? That seems possibly out of scope to me. If
 that's the case, it seems to me we can rely on indexedDB being disabled in
 PBM by Firefox's built-in mechanism and drop the #21308 patch?

 The point is that `New Identity` is not bound to PBM. In other words: we
 don't have a menu item saying "New Identity (if you are in Private
 Browsing Mode)" but rather "New Identity". It is supposed to (or I bet at
 least perceived as) give/giving you a New Identity no matter what. And I
 think that is good. Getting a clean slate should not depend on whether you
 are in PBM or are allowing disk records for some reason.

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Re: [tor-bugs] #23745 [Applications/Tor Browser]: Tab crashes when using Tor Browser to access Google Drive

[Tor Bug Tracker & Wiki]

#23745: Tab crashes when using Tor Browser to access Google Drive
-+-
 Reporter:  angelotheram2|  Owner:  tbb-
 |  team
 Type:  defect   | Status:
 |  assigned
 Priority:  High |  Milestone:
Component:  Applications/Tor Browser |Version:
 Severity:  Major| Resolution:
 Keywords:  tbb-crash, tbb-e10s, |  Actual Points:
  TorBrowserTeam201710   |
Parent ID:   | Points:
 Reviewer:   |Sponsor:
-+-

Comment (by arthuredelstein):

 I was able to reliably reproduce this crash and by bisecting our patches I
 tracked it down to our indexedDB patch:
 https://gitweb.torproject.org/tor-browser.git/commit/?h=tor-
 browser-52.4.0esr-7.5-1=31348e47a340494c4002b43d8fb509689f8f7e63
 The work for this patch and its predecessor are at #21308 and #16528
 respectively.

 I also confirmed that if I set "dom.indexedDB.enabled" to true, the
 browser no longer crashes. (Flipping this pref is not recommended for
 users, because of privacy/tracking implications. I mention it only for
 debugging purposes.)

 gk observed that the crash is being caused by a block of code in
 ActorsParent.cpp:
 {{{
 if (principalInfo.type() != PrincipalInfo::TSystemPrincipalInfo &&
 NS_WARN_IF(!Preferences::GetBool(kPrefIndexedDBEnabled, false))) {
   if (aContentParent) {
 // The DOM in the other process should have kept us from receiving any
 // indexedDB messages so assume that the child is misbehaving.
 aContentParent->KillHard("IndexedDB CheckPermission 1");
   }
   return NS_ERROR_DOM_INDEXEDDB_NOT_ALLOWED_ERR;
 }
 }}}

 But this does not happen if "dom.indexedDB.enabled" is true. I have yet to
 investigate why.

 In the meantime, I am trying to work out what our strategy should be for
 indexedDB.
 * indexedDB is a supercookie vector and has not yet been patched to
 respect first-party isolation in Tor Browser or Firefox.
 * There is [https://bugzilla.mozilla.org/show_bug.cgi?id=781982 a Mozilla
 ticket] for enabling a memory-only indexeddb in Firefox but this has not
 been resolved. In other words, indexeddb always writes to disk.
 * As [https://trac.torproject.org/projects/tor/ticket/16528#comment:7
 mikperry pointed out], there wasn't a good way to programmatically clear
 indexedDB databases. That issue may have been recently fixed in
 [https://bugzilla.mozilla.org/show_bug.cgi?id=1047098 Firefox] and we
 should investigate if we can use this in New Identity.
 * In PBM, indexedDB is already effectively disabled, even when
 "dom.indexedDB.enabled" is true.
 * Modernizr was [https://github.com/Modernizr/Modernizr/pull/2030 updated]
 a year ago to correctly detect the absence of indexedDB in Firefox PBM.
 So here are my thoughts. We should of course continue to disable indexedDB
 in PBM until it can be
 [https://bugzilla.mozilla.org/show_bug.cgi?id=781982 memory-only],
 [https://bugzilla.mozilla.org/show_bug.cgi?id=1047098 programmatically
 cleared], and [https://bugzilla.mozilla.org/show_bug.cgi?id=1405884
 isolated by first party].

 There was a concern that some users might disable PBM and then New
 Identity would fail to wipe indexedDB. Do we actually want to claim to
 protect users who turn off PBM? That seems possibly out of scope to me. If
 that's the case, it seems to me we can rely on indexedDB being disabled in
 PBM by Firefox's built-in mechanism and drop the #21308 patch?

 But if we want to protect non-PBM users, then we should investigate
 whether New Identity can clear indexedDB (#23768). That ticket would be
 useful in the future if we wanted to enable indexedDB in PBM as well.

 If instead we want to ensure we have disabled indexedDB in non-PBM windows
 as well, then I would suggest writing a new patch that simply stops
 exposing indexedDB to content by modifying [https://dxr.mozilla.org
 /mozilla-
 
esr52/rev/8abd6da9603d45bb1e29994a480e10affbb8c7d8/dom/webidl/WindowOrWorkerGlobalScope.webidl#61
 dom/webidl/WindowOrWorkGlobalScope.webidl], so indexedDB is not exposed
 when the pref "dom.indexedDB.enabled" is false.

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Re: [tor-bugs] #23745 [Applications/Tor Browser]: Tab crashes when using Tor Browser to access Google Drive

[Tor Bug Tracker & Wiki]

#23745: Tab crashes when using Tor Browser to access Google Drive
-+-
 Reporter:  angelotheram2|  Owner:  tbb-
 |  team
 Type:  defect   | Status:
 |  assigned
 Priority:  High |  Milestone:
Component:  Applications/Tor Browser |Version:
 Severity:  Major| Resolution:
 Keywords:  tbb-crash, tbb-e10s, |  Actual Points:
  TorBrowserTeam201710   |
Parent ID:   | Points:
 Reviewer:   |Sponsor:
-+-

Comment (by angelotheram2):

 It does go away when I set browser.tabs.remote.autostart.2 to false and
 restart the browser.
 I then set browser.tabs.remote.autostart.2 to back to true and the problem
 returns.
 This setting is a clue and a workaround, thanks.

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Re: [tor-bugs] #23745 [Applications/Tor Browser]: Tab crashes when using Tor Browser to access Google Drive

[Tor Bug Tracker & Wiki]

#23745: Tab crashes when using Tor Browser to access Google Drive
-+-
 Reporter:  angelotheram2|  Owner:  tbb-
 |  team
 Type:  defect   | Status:
 |  assigned
 Priority:  High |  Milestone:
Component:  Applications/Tor Browser |Version:
 Severity:  Major| Resolution:
 Keywords:  tbb-crash, tbb-e10s, |  Actual Points:
  TorBrowserTeam201710   |
Parent ID:   | Points:
 Reviewer:   |Sponsor:
-+-
Changes (by gk):

 * keywords:  tbb-crash => tbb-crash, tbb-e10s, TorBrowserTeam201710


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Re: [tor-bugs] #23745 [Applications/Tor Browser]: Tab crashes when using Tor Browser to access Google Drive

[Tor Bug Tracker & Wiki]

#23745: Tab crashes when using Tor Browser to access Google Drive
--+--
 Reporter:  angelotheram2 |  Owner:  tbb-team
 Type:  defect| Status:  assigned
 Priority:  High  |  Milestone:
Component:  Applications/Tor Browser  |Version:
 Severity:  Major | Resolution:
 Keywords:  tbb-crash |  Actual Points:
Parent ID:| Points:
 Reviewer:|Sponsor:
--+--
Changes (by gk):

 * cc: mcs, brade, arthuredelstein (added)
 * status:  needs_information => assigned


Comment:

 Replying to [comment:1 gk]:
 > Is that reproducible? Does it go away if you set
 `browser.tabs.remote.autostart.2` to `false` in your `about:config` and
 try again after restart? Does it happen with a vanilla Firefox 52 ESR as
 well? (see https://www.mozilla.org/en-US/firefox/organizations/all/ for a
 download option)

 Without e10s the crash does not happen and Firefox is not affected. mcs,
 brade, arthur: Can anybody of you take a look at that and figure out what
 is going on?

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Re: [tor-bugs] #23745 [Applications/Tor Browser]: Tab crashes when using Tor Browser to access Google Drive

[Tor Bug Tracker & Wiki]

#23745: Tab crashes when using Tor Browser to access Google Drive
--+---
 Reporter:  angelotheram2 |  Owner:  tbb-team
 Type:  defect| Status:  needs_information
 Priority:  High  |  Milestone:
Component:  Applications/Tor Browser  |Version:
 Severity:  Major | Resolution:
 Keywords:  tbb-crash |  Actual Points:
Parent ID:| Points:
 Reviewer:|Sponsor:
--+---
Changes (by gk):

 * status:  new => needs_information
 * keywords:  Tor Browser => tbb-crash
 * priority:  Medium => High
 * severity:  Normal => Major
 * milestone:  Tor: unspecified =>


Comment:

 Is that reproducible? Does it go away if you set
 `browser.tabs.remote.autostart.2` to `false` in your `about:config` and
 try again after restart? Does it happen with a vanilla Firefox 52 ESR as
 well? (see https://www.mozilla.org/en-US/firefox/organizations/all/ for a
 download option)

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[tor-bugs] #23745 [Applications/Tor Browser]: Tab crashes when using Tor Browser to access Google Drive

[Tor Bug Tracker & Wiki]

#23745: Tab crashes when using Tor Browser to access Google Drive
--+--
 Reporter:  angelotheram2 |  Owner:  tbb-team
 Type:  defect| Status:  new
 Priority:  Medium|  Milestone:  Tor: unspecified
Component:  Applications/Tor Browser  |Version:
 Severity:  Normal|   Keywords:  Tor Browser
Actual Points:|  Parent ID:
   Points:|   Reviewer:
  Sponsor:|
--+--
 Using the Linux 64-bit Tor Browser, or the Tor Browser in Tails 3.0, 3.1
 or 3.2, I log in to Google mail. After logged in I go to drive.google.com.
 The Google Drive page starts to render, then I get the message

 Gah. Your tab just crashed. We can help you!

 Choose Restore This Tab to reload page content.

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The Tor Project: anonymity online
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