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------------------------------------------------------------------------
On 2025-10-17T04:33:35+00:00 Lissyx+mozillians wrote:

Upgrading to Firefox snap release 144.0-2 the UI went from french to
english. However settings are still configured for french.

All XPI langpack are present in the snap package

Running with jsconsole shows (it reproduces on any locale that is enabled):
```
1760635026093   addons.xpi      ERROR   Failed to install distribution add-on 
/snap/firefox/7024/usr/lib/firefox/distribution/extensions/locale-fr.xpi/[email protected]:
 Error: File file 
/snap/firefox/7024/usr/lib/firefox/distribution/extensions/locale-fr.xpi/[email protected]
 contains an add-on with an incorrect 
ID(resource://gre/modules/addons/XPIInstall.sys.mjs:4185:13) JS Stack trace: 
[email protected]:4185:13
[email protected]:234:15
[email protected]:3248:35
[email protected]:3365:22
[email protected]:2735:12
[email protected]:228:31
[email protected]:537:17
[email protected]:753:14
[email protected]:3735:26
[email protected]:73:29
```

This was also reported upstream as
https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/2125183

Reproduced at least on Ubuntu 24.04.3. Weirdly on my 25.10 laptop, after
upgrading the Snap it briefly reproduced the issue and then ... It went
away.

Reply at:
https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/2125183/comments/10

------------------------------------------------------------------------
On 2025-10-17T04:40:17+00:00 Lissyx+mozillians wrote:

My laptop indeed shows in french but I still have the errors in JS
Console ...

Reply at:
https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/2125183/comments/11

------------------------------------------------------------------------
On 2025-10-17T04:47:19+00:00 Lissyx+mozillians wrote:

(In reply to :gerard-majax from comment #1)
> My laptop indeed shows in french but I still have the errors in JS Console ...

Ok so on my laptop's case, the langpack was somehow still in the
profile's `extensions`. Removing it I can reproduce, and trying to set
French again fails

Reply at:
https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/2125183/comments/12

------------------------------------------------------------------------
On 2025-10-17T04:57:25+00:00 Lissyx+mozillians wrote:

`edge` channel is fine

Reply at:
https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/2125183/comments/13

------------------------------------------------------------------------
On 2025-10-17T04:59:06+00:00 Lissyx+mozillians wrote:

Workaround: `about:addons`, click on the wheel on the right of "manage
your extensions" and select `Install Addon from file`, then browse to
`//snap/firefox/currrent/usr/lib/firefox/distribution/extensions/` and
find the right locale folder to select the right XPI file.

Reply at:
https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/2125183/comments/14

------------------------------------------------------------------------
On 2025-10-17T05:00:12+00:00 Lissyx+mozillians wrote:

(In reply to :gerard-majax from comment #4)
> Workaround: `about:addons`, click on the wheel on the right of "manage your 
> extensions" and select `Install Addon from file`, then browse to 
> `//snap/firefox/currrent/usr/lib/firefox/distribution/extensions/` and find 
> the right locale folder to select the right XPI file.

It fixes by making sure the langpack is in the profile, however there is still 
a bug as I can see:
```
1760677164375   addons.xpi      ERROR   Failed to install distribution add-on 
/snap/firefox/7024/usr/lib/firefox/distribution/extensions/locale-fr.xpi/[email protected]:
 Error: File file 
/snap/firefox/7024/usr/lib/firefox/distribution/extensions/locale-fr.xpi/[email protected]
 contains an add-on with an incorrect 
ID(resource://gre/modules/addons/XPIInstall.sys.mjs:4185:13) JS Stack trace: 
[email protected]:4185:13
[email protected]:234:15
[email protected]:3248:35
[email protected]:3365:22
[email protected]:2735:12
[email protected]:228:31
[email protected]:537:17
[email protected]:753:14
[email protected]:3735:26
[email protected]:73:29 Log.sys.mjs:722
1760677164376   addons.xpi      WARN    Checking 
/snap/firefox/7024/usr/lib/firefox/distribution/extensions/locale-en-US.xpi for 
addons
1760677164390   addons.xpi      ERROR   Failed to install distribution add-on 
/snap/firefox/7024/usr/lib/firefox/distribution/extensions/locale-en-US.xpi/[email protected]:
 Error: File file 
/snap/firefox/7024/usr/lib/firefox/distribution/extensions/locale-en-US.xpi/[email protected]
 contains an add-on with an incorrect 
ID(resource://gre/modules/addons/XPIInstall.sys.mjs:4185:13) JS Stack trace: 
[email protected]:4185:13
[email protected]:234:15
[email protected]:3248:35
[email protected]:3365:22
[email protected]:2735:12
[email protected]:228:31
[email protected]:537:17
[email protected]:753:14
[email protected]:3735:26
[email protected]:73:29 Log.sys.mjs:722
1760677164390   addons.xpi      WARN    Checking 
/snap/firefox/7024/usr/lib/firefox/distribution/extensions/locale-en-CA.xpi for 
addons
1760677164401   addons.xpi      ERROR   Failed to install distribution add-on 
/snap/firefox/7024/usr/lib/firefox/distribution/extensions/locale-en-CA.xpi/[email protected]:
 Error: File file 
/snap/firefox/7024/usr/lib/firefox/distribution/extensions/locale-en-CA.xpi/[email protected]
 contains an add-on with an incorrect 
ID(resource://gre/modules/addons/XPIInstall.sys.mjs:4185:13) JS Stack trace: 
[email protected]:4185:13
[email protected]:234:15
[email protected]:3248:35
[email protected]:3365:22
[email protected]:2735:12
[email protected]:228:31
[email protected]:537:17
[email protected]:753:14
[email protected]:3735:26
[email protected]:73:29 Log.sys.mjs:722
1760677164401   addons.xpi      WARN    Checking 
/snap/firefox/7024/usr/lib/firefox/distribution/extensions/locale-en-GB.xpi for 
addons
1760677164410   addons.xpi      ERROR   Failed to install distribution add-on 
/snap/firefox/7024/usr/lib/firefox/distribution/extensions/locale-en-GB.xpi/[email protected]:
 Error: File file 
/snap/firefox/7024/usr/lib/firefox/distribution/extensions/locale-en-GB.xpi/[email protected]
 contains an add-on with an incorrect 
ID(resource://gre/modules/addons/XPIInstall.sys.mjs:4185:13) JS Stack trace: 
[email protected]:4185:13
[email protected]:234:15
[email protected]:3248:35
[email protected]:3365:22
[email protected]:2735:12
[email protected]:228:31
[email protected]:537:17
[email protected]:753:14
[email protected]:3735:26
[email protected]:73:29

Reply at:
https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/2125183/comments/15

------------------------------------------------------------------------
On 2025-10-17T05:08:53+00:00 Lissyx+mozillians wrote:

Could it come from: https://github.com/canonical/firefox-
snap/commit/4b531f4ef16036f0414c69234b5e408dde94f436#diff-e68b9afd67bb77dec8eda77796d3e0b784c7011203114996383eed6533be0cefR533

Reply at:
https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/2125183/comments/16

------------------------------------------------------------------------
On 2025-10-17T05:27:34+00:00 Lissyx+mozillians wrote:

Pushed to try https://github.com/canonical/firefox-snap/pull/158 =>
https://treeherder.mozilla.org/jobs?repo=try&revision=346b40e5cf322ead1aa67383ec799d9c19ea7a19

Reply at:
https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/2125183/comments/19

------------------------------------------------------------------------
On 2025-10-17T07:01:21+00:00 Lissyx+mozillians wrote:

(In reply to :gerard-majax from comment #7)
> Pushed to try https://github.com/canonical/firefox-snap/pull/158 => 
> https://treeherder.mozilla.org/jobs?repo=try&revision=346b40e5cf322ead1aa67383ec799d9c19ea7a19

Downloading the `firefox_144.0-2.snap` from this try and installing
with: `sudo snap install --dangerous ./firefox_144.0-2_amd64.snap`, and
also I had to remove `extensions.installedDistroAddon.langpack-
[email protected]` pref to make sure it properly tried to reinstall
the addon.

After that it is working again.

Please dont use this build for anything else than testing, it would
break snap as you would not get anymore updates. If you installed it
then you should `sudo snap refresh --amend firefox` to revert to the
proper snap package. It should not regress the langpack.

Reply at:
https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/2125183/comments/20


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

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Title:
  upgrade Firefox snap change la  langue (pour English)

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