You might have heard the news that future versions of Firefox will run the browser UI separately from web content. This is called Multi-process Firefox (also “Electrolysis” or “e10s”), and it will improve browsing performance for your users.

If your add-on code accesses web content directly, using an overlay extension, a bootstrapped extension, or low-level SDK APIs like window/utils or tabs/utils, then you will probably be affected.

Multi-process Firefox is scheduled for release in the next few months, so we urge you to test your add-ons for compatibility.

If it breaks in Multi-process Firefox, your users will be impacted, and you will need to update your add-on. You can find documentation on how to make them compatible here.

If it does not break in Multi-process Firefox, you will need to flag it as compatible in the install manifest.

We are available to assist you every Tuesday in the #addons channel at irc.mozilla.org. Click here to see the schedule. Whether you need help testing or making your add-ons compatible, we’re here to help!