The day I consider my WWW browser the most important software on my PC is the day I go back to dialup. Frankly, I agree with your base theory - that's why the important software on my PC is Windows and MSOffice, rather than *nix and Open or Libre Office. I moved off the OO/LO platform a little after the split, because compatibility was an issue.

But for a limited use program like a browser, yeah, I want the people who won't disappoint me.