# Can't use Firefox Add-on in new version of Firefox

**URL:** <https://discourse.mozilla.org/t/cant-use-firefox-add-on-in-new-version-of-firefox/79111>\
**Category:** Add-ons\
**Created:** [April 22, 2021, 1:35pm UTC](https://discourse.mozilla.org/t/cant-use-firefox-add-on-in-new-version-of-firefox/79111 "2021-04-22T13:35:34Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![zydjohn](https://avatars.discourse-cdn.com/v4/letter/z/91b2a8/32.png) [@zydjohn](https://discourse.mozilla.org/u/zydjohn)\
**Post date:** [April 22, 2021, 1:35pm UTC](https://discourse.mozilla.org/t/cant-use-firefox-add-on-in-new-version-of-firefox/79111/1 "2021-04-22T13:35:35Z")

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Hello:  
I have made a few Firefox Add-ons, and used them in production, it worked for a few weeks.  
But after Firefox has the new version 88.0(64-bit), I found I can’t use my Firefox Add-ons any more.  
The issue looks like that all the Add-ons disapper from the toolbar, even I tried to custome toolbar, still I can’t see any of the Firefox Add-ons icons appear on the toolbar.  
However, it is not totally disappeared, but hide somewhere in the double arrow icon.  
However, the issue for my Firefox Add-ons is: I can’t launch it any more.  
The only way to use my Firefox Add-ons is that I can use the un-zipped in Test Mode.  
Let me know how to fix this issue.  
I think the most important thing is how I can put the Add-On icon on the Firefox browser toolbar as in old version of Firefox. It is also true for another Firefox Add-on: “Privacy Pass”.  
Please advise!