Add-on compatibility checker

WebExtensions are becoming the standard for add-on development in Firefox. At the same time, multiprocess Firefox (aka Electrolysis, or e10s) is also rolling out. These changes impact developers of XUL/XPCOM and SDK add-ons (some more than others).

Use the tool below to check the compatibility of your add-on as it relates to these changes, and learn what your options are for transitioning if you are affected.

You will need your add-on guid, which is found in one of the following places:

Your add-on guid should be one of the following:

The list of add-on ids is generated by inspecting add-ons listed on If you have questions about your add-on, our team is here to help.

Source of this tool is on github.