Is selenium IDE an XUL add-on in Firefox?

Question

With Firefox discontinuing the use XUL overlay it raises concerns that Selenium IDE requires this overlay to function. Can anyone confirm one way or the other?

Mozilla Will Deprecate XUL Add-ons Before the End of 2017

Answer 1

Selenium IDE is definitely an overlay/XUL based add-on. It contains an instal.rdf file and chrome.manifest file which uses the overlay directive.

Mozilla has stated that all types of extensions, other than WebExtensions, will be disabled in the near future. They have stated that the target for this is the 2017-11-14 release of Firefox 57. This deprecation may include complete themes, which they have stated "we will provide more details on what's coming for themes very soon". That XUL based extensions would be deprecated was announced on 2015-08-15 . The fact that they would be disabled in Firefox 57 (late 2017) was announced on 2016-11-23 .

Mozilla has previously stated that such add-ons will not be explicitly disabled in Firefox Developer Edition and Nightly . However, a primary reason for deprecating such add-ons is that Mozilla wants the freedom to change the underlying Firefox code without worrying about add-on compatibility, other than WebExtensions. Thus, Firefox may change such that the features such add-ons rely upon are no longer available. Another alternative would be to use an Extended Service Release (ESR) version of Firefox . Firefox ESR 52 will be the current ESR at that time. My answer to " How to develop legacy Firefox add-ons in the future? " has more detail about possible options for continuing to use legacy add-ons.

I have not seen anything from Selenium IDE describing their plans for this change.