Firefox, Opera (yes, even Google Chrome)... all are worth using, all have various pros and cons.
Things I like:
Firefox can bookmark a load of tabs in one folder, in one go (and later, re-open all of them in one go).
Firefox has hundreds of add-ons that can assist in different tasks, blocking adverts, examining web sites, etc.
Firefox can also display a page using the Internet Explorer display engine, via some add-on, in case something gives errors on Firefox.
Opera can synchronize notes and bookmarks so if you have your own PCs in different places (office, laptop, desktop at home) any bookmark you add can be seen on the other PCs too. Also notes (text) made via one machine will be visible on the others too.
Opera has a 'speed dial' feature (copied via an add-on for Firefox) that allows you to have up to 25 favourite sites on a grid (3x3 up to 5x5 depending on how big your screen is). A thumbnail image is shown for each site so you can quickly spot the one you want (eg bank, BBC, Five on Demand, etc)
Chrome allows you to pull tabs from one window to another (or to create a new separate window).
I still use Netscape v7.2 (Firefox is based on some of the code from Netscape). I started using Netscape in the mid-90s and still have some floppy disks from my first (US) ISP with Netscape 1.1 (for Windows 95 I think, or Windows 3.11)