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Can't install any add-ons - "You need to download Firefox to install this add-on.". Firefox is latest version.

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  • 17 have this problem
  • Last reply by Bluegreen0

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After upgrading to Quantum, I'm unable to install any add-ons from

I've made sure I'm using the latest version of Firefox.

When I find an add-on I want to install (having checked it's compatible with Quantum), the 'Add To Firefox' button is always disabled and below is a red banner saying: "You need to download Firefox to install this add-on."

Does anyone have any suggestions?

Edit - I've also made sure there are no active add-ons.


Modified by Bluegreen0

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hello, please see if this helps: How to reset the default user agent on Firefox

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Thanks philipp, that worked. Appreciate your help (and the quick response).

As an aside, even when the button was disabled, I found I was able to download the add-on xpi manually.

Right-click the disabled "Add To Firefox" button, and select "Save Link As". Then drag and drop the downloaded xpi file on to Firefox to install it.