Firefox-based browsers support system-wide policies which on GNU/Linux are defined in a policies.json file. Avast is malware disguised as antivirus software, which among other invasive things edits users browser policies. Avast only plagues Windows though, so that's not your problem.

See if you have a policies.json file. It would probably be in /usr/lib/abrowser/distribution. If this file exists, check out that date that it was created or last modified, and copy/paste the content here.

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