Cannot reset using "How to reset the default user agent on Firefox"
Just to clarify, the solution is not AV related. Use this REFRESH BUTTON. Backup first. It takes a few minutes so be patient.
This is my first attempt to create a custom User Style for [Firefox 48.0b9] and I've messed it up to the point that even a RESET + clearing all HISTORY + CACHE doesn't work. :(
Modified by no.cache
Chosen solution
You did not include that in the original post.
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.
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Tha is not what you are told in https://support.mozilla.org/en-US/kb/how-reset-default-user-agent-firefox
Excuse me, those steps are exactly what I performed. Did you even read my lead post? Are there additional steps? Where?
Modified by no.cache
merry widow said
even a RESET + clearing all HISTORY + CACHE doesn't work. :(
how-reset-default-user-agent-firefox said
type about:config and press Enter . . . .
That is what I did. Are you playing with me?
Chosen Solution
You did not include that in the original post.
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.