Bugzilla

I think I might have found a way to replicate this, it would be great if someone else can try.

I'm using a recent Italian Nightly build, but I would expect this to work on an English build as well (I'm on 20200629154604, 80.0a1), given the language pack should override it.

1) Enable unsigned language pack by setting `extensions.langpacks.signatures.required` to false, and enable UI language switcher setting to `intl.multilingual.enabled` true.

2) Install the two language packs that I'll attach to the bug (en-US and fr). They're old language packs (e.g. [for English](http://archive.mozilla.org/pub/firefox/nightly/2020/05/2020-05-11-21-47-06-mozilla-central/)) that I've unpacked, removed signatures, and added an empty featureGates file to avoid localization falling back for lack of a FTL file in the context.

3) Set French as first requested locale, and English as second locale. Restart the browser. In my case I had to force quit the browser.

I think I might have found a way to replicate this, it would be great if someone else can try.

I'm using a recent Italian Nightly build, but I would expect this to work on an English build as well (I'm on 20200629154604, 80.0a1), given the language pack should override it.

1) Enable unsigned language pack by setting `extensions.langpacks.signatures.required` to false, and enable UI language switcher setting to `intl.multilingual.enabled` true.

2) Install the two language packs that I'll attach to the bug (en-US and fr). They're old language packs (e.g. [for English](http://archive.mozilla.org/pub/firefox/nightly/2020/05/2020-05-11-21-47-06-mozilla-central/)) that I've unpacked, removed signatures, set compatibility to 80.a1, and added an empty featureGates file to avoid localization falling back for lack of a FTL file in the context.

3) Set French as first requested locale, and English as second locale. Restart the browser. In my case I had to force quit the browser.