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Can't download extensions - error says "To use these add-ons, you'll need to download Firefox" while I'm using Firefox

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I'm having trouble downloading any add-ons whilst using Firefox the error says:

"To use these add-ons, you'll need to download Firefox"

I have re-download Firefox and the error still shows up.

Not sure what else to do.

Photo added for reference.

Ama-screenshot ananyekiwe

All Replies (4)

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Your User Agent shows: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:92.0) Gecko/20100101 Firefox/92.0/Yb0YyIeG-55

Note the junk at the end.

Do you have enabled "Resist Fingerprinting" if you check ‘’’Resist Fingerprinting’’’ on the ‘’’about:config’’’ page as this affects the user agent?


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This could be a problem with Avast Anti-Track that has modified the user agent, so if you use this software then try to disable it.


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Thanks for both your replies, somehow I used Firefox on a laptop device, managed to download the add-on above and when I came back to my desktop it was added within the toolbar.

I will keep an eye on Avast as I do use it.


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Note that a lot of websites may have a problem with a modified user agent in the way yours is as they do not expect extra data after Firefox/92.0.


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