FRiend, I’ve been running Firefox for years, and trust it. Although, some of the other posters are correct; newer versions are using more memory, and are crashing more often...still, it beats IE by a ton. Also, take a look at Opera and Google Chrome. I don’t trust google, so I don’t use it but I have many friends who do and like it.
I own GOOG stock, but dont trust it with MY email...scary company
I like Chrome and prefer it over Firefox after I got used to the different layout.
On Linux (Mint, Ubuntu), I prefer Chrome over Firefox.