avast broke firefox

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Avast told me to uninstall an unsafe addon 'English language pack' and now firefox is all blank except this text '<window id="main-window"
^'

I uninstalled firefox and clean install but it is the same.

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I have the same issue. Avast just told me to uninstall unsafe addons and broke firefox

<window id="main-window"
^

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I think I have a solution. The problem is on the Firefox Profile, specific in addons.json and addonStartup.json.lz4 files. In order to fix your profile without loosing everything by creating a new one, I suggest you to create a new profile in another folder (press windows+R and write: firefox -p)
After that you need to go to the new firefox profile and copy both files and replace the old ones. At least it worked for me

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FIXED: had to rename mozilla files to mozilla.old. copied them as a backup and reinstalled firefox.

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Someone else had the same thing, i think it was a false positive and removing the language pack messed firefox up. (it had a 2 star rep) I know some addons can be intrusive but it would be nice if avast told you why it was bad.

[Asyn]

Hi guys, I forwarded it to the devs.

Workaround: https://techdows.com/2018/09/avast-avg-bad-add-on-warning-leads-users-to-break-firefox.html

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Thank you i know alot of people have more stupid addons than language packs

[Asyn]

You're welcome.

[Asyn]

Note: It should be fixed now.