Try Classillia downloadable from http://www.floodgap.com/software/classilla/releases/
Also if I may add to this post. This G3 blue and white computer came with Mac OS X. But I couldn't reset the login password and didn't have the original OS CD, so couldn't get into it. The computer probably hadn't been run in years. I had to replace the pram battery, date was 2003. And had to replace the ram.To get it to start.
Then I installed Mac OS 9.0.4, because I couldn't get into OS X without the password.
I had saved the entire software pack from a iMac DV I bought in 2000. What I've read is, that OS disk would be specific for that iMac only, it installed on the G3.
I don't think the computer hard drive reformatted with the install of OS 9? The OS only took about 15 minutes to install. I didn't see a reformat window come up where I could make a choice.
My question is, would OS X still be on this G3? Or was it removed with the OS 9 install? I don't know how to locate it if it still is?
Update I found javacript and able to run the internet but terribly slow. My guess is not being able to get a newer browser with OS 9. I seem to think OS X may run newer browsers but probably lost it when installing OS 9.
I found this old post by Don Archibald. The 3rd post from the bottom refers to holding down the X key while restarting and a alternate method of holding down a combination of keys. So far that didn't show if OS X is still on the computer. So hopefully if anyone shows up they may be able to offer some advice.
Also I maxed out the ram today, to 1 gig on this G3. But that didn't help with internet at all, but the OS runs well.