Classification: UNCLASSIFIED

Excellent, thanks for the assist.

Have a great day and keep on keeping!

Eric

From: Mike Kaply <[email protected]>
Sent: July 2, 2020 9:53 AM
To: Periard, Eric <[email protected]>
Cc: [email protected]
Subject: Re: [Mozilla Enterprise] Error with using system proxy settings (when 
changing from using "automatic proxy configuration URL" by default via 
policies.json)


EXTERNAL EMAIL – USE CAUTION / COURRIEL EXTERNE – FAITES PREUVE DE PRUDENCE
No policy for the downgrade protection. We weren't seeing a lot of folks 
running into this so I didn't add policy.

Note that starting with 77, we did tweak the downgrade protection so it 
wouldn't happen with major versions:

https://bugzilla.mozilla.org/show_bug.cgi?id=1588113<https://can01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fbugzilla.mozilla.org%2Fshow_bug.cgi%3Fid%3D1588113&data=02%7C01%7CEric.Periard%40cyber.gc.ca%7Cc44d8579960548c7e36108d81e8f31a2%7Cda9cbe40ec1e4997afb317d87574571a%7C0%7C0%7C637292947650523765&sdata=oMX1YvMUNcR9OVJvHDr6245wwZOvjCHY1uzjScj8lfY%3D&reserved=0>

So most folks using the ESR won't see this anymore.

Mike

On Thu, Jul 2, 2020 at 8:49 AM Periard, Eric 
<[email protected]<mailto:[email protected]>> wrote:
Classification: UNCLASSIFIED

Is there also a Group Policy for that or I absolutely need to go oldskool on 
this one?

Eric

From: Mike Kaply <[email protected]<mailto:[email protected]>>
Sent: July 2, 2020 9:47 AM
To: Periard, Eric <[email protected]<mailto:[email protected]>>
Cc: [email protected]<mailto:[email protected]>
Subject: Re: [Mozilla Enterprise] Error with using system proxy settings (when 
changing from using "automatic proxy configuration URL" by default via 
policies.json)


EXTERNAL EMAIL – USE CAUTION / COURRIEL EXTERNE – FAITES PREUVE DE PRUDENCE
Yeah, MOZ_ALLOW_DOWNGRADE is definitely what you want.

Mike

On Thu, Jul 2, 2020 at 8:05 AM Periard, Eric 
<[email protected]<mailto:[email protected]>> wrote:
Classification: UNCLASSIFIED

I will try this out, thanks!

I have since upgraded to the latest ESR, but just in case….

Eric

From: Mike Kaply <[email protected]<mailto:[email protected]>>
Sent: July 1, 2020 2:47 PM
To: Periard, Eric <[email protected]<mailto:[email protected]>>
Cc: [email protected]<mailto:[email protected]>
Subject: Re: [Mozilla Enterprise] Error with using system proxy settings (when 
changing from using "automatic proxy configuration URL" by default via 
policies.json)


EXTERNAL EMAIL – USE CAUTION / COURRIEL EXTERNE – FAITES PREUVE DE PRUDENCE
You can read more about this here:

https://support.mozilla.org/en-US/kb/understanding-depth-profile-installation<https://can01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fsupport.mozilla.org%2Fen-US%2Fkb%2Funderstanding-depth-profile-installation&data=02%7C01%7CEric.Periard%40cyber.gc.ca%7Cc44d8579960548c7e36108d81e8f31a2%7Cda9cbe40ec1e4997afb317d87574571a%7C0%7C0%7C637292947650523765&sdata=4kGKPThjkmN02qmthxOcusfgRgG7ZS4x6NP5i%2BHbILw%3D&reserved=0>

But specifically at the end:

" The downgrade blocking can be bypassed by setting the environment variable 
MOZ_ALLOW_DOWNGRADE or by passing the --allow-downgrade command line argument 
when running Firefox."

Hopefully this should accomplish what you need.

Alternatively if it is a problem with the new Firefox being installed in a 
different directory, you can use the MOZ_LEGACY_PROFILES environment variable 
or the LegacyProfiles policy - 
https://github.com/mozilla/policy-templates/blob/master/README.md#legacyprofiles<https://can01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Fmozilla%2Fpolicy-templates%2Fblob%2Fmaster%2FREADME.md%23legacyprofiles&data=02%7C01%7CEric.Periard%40cyber.gc.ca%7Cc44d8579960548c7e36108d81e8f31a2%7Cda9cbe40ec1e4997afb317d87574571a%7C0%7C0%7C637292947650533763&sdata=u7EbMT70SSHMsmFeiM68%2FaYkMoOTzwhRH547D5Tostc%3D&reserved=0>

Mike

On Wed, Jul 1, 2020 at 12:04 PM Periard, Eric 
<[email protected]<mailto:[email protected]>> wrote:
Classification: UNCLASSIFIED

Hello,

Here’s an interesting situation: We’ve recently created a USMT Windows User 
Profile Backup and Restore package via SCCM and that works fine, however 
there’s a catch 22 with firefox….

Usually I keep a baseline version of the package via the Software Center and 
the users can update the browser via the ABOUT menu.

However if a windows profile is restored to a new system (with AppData) and 
then firefox is installed from the Software Center, of course it’s old and it 
sees the newer profile as incompatible.

so far the only solution I got is to go ahead and update the baseline version 
of my Firefox package.

So here’s my questions:

1. Is it possible somehow to load a new profile onto an old Firefox?
2. Is it possible to force Firefox to look for updates as soon as someone tries 
to open it?
3. If 2. is possible, would it fetch the update before prompting the user to 
create a new profile?

Please advise, this seems to be a none-issue with Chrome post-user mig.

Thanks

Eric
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