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On 2020-02-21T22:28:51+00:00 Dan Watkins wrote:

User Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:73.0)
Gecko/20100101 Firefox/73.0

Steps to reproduce:

Enabled Strict tracking protection and, after several weeks of using
Firefox, launched Firefox one day and the bug occurred. I have not been
able to reliably reproduce it, though once in the buggy state, it
reproduces on every launch.

I've experienced this on (Ubuntu's version of) 72.x and 73.x, as well as
back in August on what would probably have been 68.x (but I didn't make
a note).


Actual results:

No tabs would display any content. I restored my tabs, so this included
pins, regular sites, and extension dialogs.  Further to that, Firefox
menus also wouldn't display; either via right-click on tabs, or via the
"hamburger" menu in the top-right. (I could still close tabs via Ctrl-W
for non-pinned tabs, or via middle-click for pinned tabs.)

favicons were displayed correctly, and I confirmed that the pages were
actually being fetched from the remote sites because I typed the address
for a page I know redirects and the redirect happened (specifically, "!g
foo" in my address bar caused DuckDuckGo to redirect me to Google).

Restarting the browser did not fix this. Closing all of my tabs and
restarting the browser did not fix this. Closing all of my tabs and
restarting the browser, however, _did_ allow the Firefox menus to render
(provided I didn't try to open any web pages before using them), which
allowed me to switch "Enhanced Tracking Protection" from Strict to
Standard, fixing the problem (on browser restart).

I also noticed that at least part of the problem appears to apply only
per-window: if I opened a new window then menus would render in that
window (until I opened a web page).

I have been able to re-enable Strict mode on the first launch after
switching away from it, and the browser continues to function normally.


Expected results:

Firefox should have behaved as it always does, displaying site content.

Reply at:
https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/1861913/comments/5

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On 2020-02-21T22:30:20+00:00 Dan Watkins wrote:

I originally reported this downstream in Ubuntu here:
https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/1861913

Reply at:
https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/1861913/comments/7

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On 2020-02-26T10:05:12+00:00 Daniel-bodea wrote:

I did not manage to reproduce your issue using the provided information. 
Daniel, When this issue occurs, can you check the Browser Console for errors 
and put them here?
Furthermore, since I do not really know what could cause this issue or how to 
troubleshoot it, please also go to the "about:support" page, copy and paste the 
information displayed about your system. Hopefully, it will help.

Thank you for your contribution!

Reply at:
https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/1861913/comments/8


** Changed in: firefox
       Status: Unknown => New

** Changed in: firefox
   Importance: Unknown => Medium

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https://bugs.launchpad.net/bugs/1861913

Title:
  "Strict" tracking protection sometimes causes _all_ content to fail to
  display on browser launch

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