This is the big tracking bug to implement a user interface for explaining to users what the extensions they have enabled do. Some examples: * which extension is currently controlling about:home or about:newtab * which extension has which key binding * which extension is using proxy settings * which permissions you have granted to each extension * etc... The list is quite long and will grow as we add new APIs to Firefox. There's probably a few steps to this project, but the first phase is probably to stand up a UI in about:addons that just shows some of these settings. The second phase would be to allow users to select or pick and choose from these settings. To have a change to keep about:addons sane, it would make sense to not pollute the add-ons listing any further and see if we can put this all on a seperate page, maybe.