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Selenium IDE Does not work with FireFox version 55 or later

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Article Number000003952


The Mozilla browser made major changes to the functionality of extensions in version 55 and later. Due to this the Selenium IDE will not be supported in the newer versions of the Mozilla browser until Selenium is able to release an updated extension. Mozilla does however offer an "Extended Support Release" which includes legacy support for browser extensions such as the Selenium IDE

More details from Selenium:
More details on Mozilla Extended Support Release:


Use the official Mozilla FireFox ESR (Extended Support Release) version which will support the Selenium IDE
Download the installer from
Ask your company IT Helpdesk if you need assistant with installation of FireFox ESR

Once you have started FireFox ESR you will be able to run/install Selenium IDE ( as intended

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