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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
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  • Last reply by Bluegreen0

Bluegreen0
Bluegreen0
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After upgrading to Quantum, I'm unable to install any add-ons from https://addons.mozilla.org.

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.

Thanks

After upgrading to Quantum, I'm unable to install any add-ons from https://addons.mozilla.org. 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. Thanks

Modified by Bluegreen0

Chosen solution

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

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philipp
philipp
  • Moderator
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Chosen Solution

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

Bluegreen0
Bluegreen0 Question owner
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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.