While there could be many ways to fix this issue, solve Microsoft Edge issue with these steps.
Disabling a plugin will turn it off without removing it:
Click the menu button
and choose Add-ons. The Add-ons Manager tab will open.
In the Add-ons Manager tab, select the Plugins panel.
Select the plugin you wish to disable.
Select Never Activate in its drop-down menu.
To re-enable the plugin, find it in the list of Plugins and select Always Activate in its drop-down menu.
1.Open Firefox web browser.Click up to Firefox menu in top right corner and click Add-ons from sub-menu.
2.Then click Plugins and you can see a list of plugins, choose the plugin which you don't want, Click on Always Activate to select Never Activate. Restart Firefox, it'll works.