Multiprocess Windows in Firefox

Add-ons Add-on Support
#1

I am trying to figure out which of my four addons in Firefox (ver. 55.02) has apparently disabled the ability to make use of Multiprocess Windows in the browser. Inspecting “about:support” in Firefox, I see this configuration setting, among others:

Multiprocess Windows 0/1 (Disabled by add-ons)

I would like to know which of my addons has done this so that I can experiment with this browser setting in the interest of making the program more secure and efficient if possible. I am basing my tests on the information from Mozilla Developer Network, as explained here: “https://wiki.mozilla.org/Electrolysis”. How can I determine exactly which of these four addons is the cause, and if more than one would be responsible. Thanks.

#2

The first brush would be to install the Add-on Compatibility Reporter, which will annotate the Add-Ons -> Extensions page with “(i) Compatible with multiprocess” or “/!\ Not compatible with multiprocess”. You would definitely want to remove or replace the ones not compatible with multiprocess.

Even when the Add-on Compatibility Reporter says an extension is compatible, there are a few that are on Mozilla’s incompatibility list so, if the Compatibility Reporter shows every extension is compatible with multiprocessing, and you still see “(Disabled by add-ons)” in about:support, you may have to disable your extensions, restart Firefox, and see by trial and error which one’s are still problematic.

#3

I do appreciate the good advice, which I followed successfully to fix this issue. The Compatibility Reporter addon pinpointed the problem right away, having occurred from an addon called “Mozilla Archive Format” (http://maf.mozdev.org/). I disabled it and Firefox immediately became capable of multiprocess mode. That is a relief.

Unfortunately, I have saved a lot of files in MAFF format because it is a convenient way to save web pages locally as I browse so that I can simply click on the “file.maff” to view it later in Firefox. According to the information provided on the above link (http://maf.mozdev.org/), this add-on will not be made compatible with future versions of Firefox, if I read it correctly. Still, it also pointed out that I should be able to open the archives manually with a zip program once I have extracted the contents, or I can rename the files with a zip extension. This is inconvenient but less distressing than loosing access to the contents completely.

I suppose that I shall have to save web pages as regular html files from now on. It is sufficient for most cases, and I can later open such files with pretty much any browser. Thanks, again, for the help. Take care.