Seeing many comments to the effect, "This doesn't concern me because I don't rely on any XUL-base extensions." It's great if this change isn't going to affect you, but I'd ask you to ask yourself what if it were going to? What if Firefox was going to drop support for 90% of Add-Ons you do use? What would you do?

Ditch Firefox for some other browser? Probably. And that's probably what most users who rely on XUL-based Add-Ons will do.

So, I think we as Firefox users need to consider the bigger picture here. If this change to WebExtensions moves forward as planned, it will probably cost Firefox a fair number of users (probably most of them power users) at a time when Mozilla is really starting to turn around the slump they've been in since ~2013-2014.

So, if you don't sign the petition for yourself, sign it for the greater good of Firefox and its long-term viability as a legitimate contender to Google Chrome. All we petitioners are asking is that Mozilla move forward with a viable XUL-replacement. Currently, that's not WebExtensions.