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I'm used to using the extension "Пульт". I guess that means "Remote control". After a recent update, this extension has been removed. I received this message: " The Remote control in Firefox has not been tested, so it has been disabled." I want to restore this application and ask for help.

I'm used to using the extension "Пульт". I guess that means "Remote control". After a recent update, this extension has been removed. I received this message: " The Remote control in Firefox has not been tested, so it has been disabled." I want to restore this application and ask for help.
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You have to check that the Addon is compatible with latest version of Firefox browser you have installed.

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Some older extensions that are not hosted on the Mozilla Add-ons site will stop working if their authors did not have then re-signed with a new certificate in the past year or do.

Could you copy/paste the full line for that extension from the Add-ons table on the Troubleshooting Information page: Use the Troubleshooting Information page to help fix Firefox issues.

For example:

Add-ons Search Detection extension 2.0.0 true addons-search-detection@mozilla.com

(Format could get a little messy, but don't worry about that.)

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Or maybe try this first:

On the Add-ons page, click the "gear" button on the right side, then "Check for Updates".

Ref. How to update add-ons