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JavaScript does not work on sites

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  • Letzte Antwort von cor-el

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I'm using version 81.0 and Javascript does not fully function on a site that I use daily for school. I've tried refreshing Firefox, restarting, logging out and in of the site and firefox, and clearing my cache. The site worked when I used Safari which means this must be an issue with the update. My question is how can I get the site to work in Firefox again? Can i even do that?

I'm using version 81.0 and Javascript does not fully function on a site that I use daily for school. I've tried refreshing Firefox, restarting, logging out and in of the site and firefox, and clearing my cache. The site worked when I used Safari which means this must be an issue with the update. My question is how can I get the site to work in Firefox again? Can i even do that?

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What specific JavaScript isn't working ?

Did you check the Web Console ?


If you use extensions ("3-bar" menu button or Tools -> Add-ons -> Extensions) that can block content (Adblock Plus, NoScript, Disconnect, Ghostery, Privacy Badger, uBlock Origin) always make sure such extensions do not block content.

Firefox shows a purple shield instead of a gray shield at the left end of the location/address bar in case Enhanced Tracking Protection is blocking content. You can click shield icon for more detail and possibly disable the protection. You can check the Web Console for messages about blocked content.


You can remove all data stored in Firefox for a specific domain via "Forget About This Site" in the right-click context menu of an history entry ("History -> Show All History" or "View -> Sidebar -> History").

Using "Forget About This Site" will remove all data stored in Firefox for this domain like history and cookies and passwords and exceptions and cache, so be cautious. If you have a password or other data for that domain that you do not want to lose then make sure to backup this data or make a note.

You can't recover from this 'forget' unless you have a backup of involved files.

If you revisit a 'forgotten' website then data for that website will be saved once again.