Grab the bottom corner of the window & just spread it out across your screen. Increase or decrease the size of your fonts if need be.
You can also change the screen dimensions which will affect the size of of the webpages & the windows on your screen. I forgot where the setting is in OS 9.x (Monitor control panel?). Hopefully, someone else who still uses OS 9.x will chime in here w/the correct info.
Make sure you are using the latest version browser for the OS you are currently using.