I recommend that you look into what you're getting with software freedom -- the single most important aspect that makes Firefox different from Google Chrome, Microsoft's web browsers, Opera, or Apple Safari. All of the items on your list can be changed by using your software freedom. And this doesn't have to involve you learning to program (though that wouldn't be a bad idea). It could involve you asking programmers nicely to help you out, or hiring programmers to improve Firefox to be what you think it should be, or getting funds together with others who share your views to collectively fund programmers who work on your shared goals.
As it stands your desire reads selfishly because it is indistinguishable from you saying that you want programmers to develop a free software (free as in freedom to run, inspect, share, and modify) web browser you trust without you doing anything to help vet its trustworthiness or modify the software until it becomes software you trust. We don't have to settle for doing nothing; software freedom lets us have as much control over free software as we wish to have. The limits are on us to make things better.