Can't change language
I live in Sweden. My Windows 10 is in English. I have NO CONNECTION to Spanish. But still, when I installed Firefox, the installer was in Spanish. I double checked that I hadn't downloaded a Spanish version of some sort, but no. I didn't think more of it, since I was able to change the browser language to English upon installation. But now, upon updating Firefox, it has changed it back to Spanish and even though English (US) is ranked above Spanish in my list in "Options", all settings and websites are still showing in Spanish and I don't know why. Help is much appreciated and perhaps some developer can forward this as a bug report because I see no reason why this could have happened.
Chosen solution
Solved it! My English (US) language pack was apparently incompatible with my version of Firefox and had become disabled. Automatic updates for the language packs was set to "Default", I changed it to "On" so it updated the language pack and now everything is back to English when I restarted Firefox.
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Are you using any language packs?
Start Firefox in Safe Mode {web link}
A small dialog should appear. Click Start In Safe Mode (not Refresh). Is the problem still there?
Hey Fred, thanks for the reply! I tried starting it in Safe Mode and the problem is still there. It may be worth noting that when I click the drop-down-menu icon in the top right, the options are in Spanish, but when I click "Opciones" (Options), it's in English.
And I don't have any language packs except English.
Chosen Solution
Solved it! My English (US) language pack was apparently incompatible with my version of Firefox and had become disabled. Automatic updates for the language packs was set to "Default", I changed it to "On" so it updated the language pack and now everything is back to English when I restarted Firefox.
That was very good work. Well Done.
If you only need Firefox in one language (English) then best is to install that Firefox language version and not use a language pack.
You can find the full version of the current Firefox release (73.0.1) in all languages and all operating systems here: