Then Chrome arrived. Moz tried the same strategy too, but it was not working. So they tried to beat Google with their own weapon. Again it did not worked out. So why still going on with that. Moz had a nice market share. Enough to shove it into Google's face and make them realize that they are not winning to 100%. But Moz wanted to become number one, no matter what it has to be done to reach that goal

History has showed it that crusades never will lead to success. Mozilla are crusaders on a holy war for destroying Google Chrome. But: Crusades never will lead to success. We had a believe driven crusade which failed. We had a war driven crusade which failed (luckily). What makes you believe that you win your crusade?

Also to count into is the following: https://blog.mozilla.org/addons/2017/02/16/the-road-to-firefox-57-compatibility-milestones/#comment-223542 Jorge made it more than clear that ui customization is no longer a supported functionality

Also what Mozilla often talks about: Maintenance costs is a reason, but not the biggest. The thing is simple users are representing the biggest part of the market share . So companies today restrict and remove features from which they know that simple users are not going to accept them and refusing to use a browser with such features inside. Ask a simple user if he would use a software with customization and tons of accessibility features inside. The answer is a clear no-brainer. Saved money is a nice side effect, but not the main reason of all that. We experience a 180 degree shift of priorities. Advanced users are the one's who lose everything as it is not possible to earn enough with users like us today.

What is your opinion about that?