web extensions doesn't save settings
Every time I start Firefox I should configure extensions settings and the next time I start browser the settings changed to it's original. I tried resetting firefox multiple times but it didn't work.
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that is usually some sort of antivirus or security program doing something it thinks helps but actually does not.
https://support.mozilla.org/en-US/kb/how-to-fix-preferences-wont-save
Note: Some software, like Advanced SystemCare with Surfing Protection, can protect files in the Firefox profile folder against changes. If you have such software then check the settings or uninstall this software.