One feature I really love in Firefox, that probably does not get the credit it deserves, is the smart zooming features. A feature that was new to Firefox 3, this allows you to zoom an entire page to make it larger or smaller. You may need to make a site larger to make it easier to read, or you might make it smaller to fit within the screen real estate of your smaller monitors (for examples, those people out there who may have netbooks).
There are several ways you can zoom into or out of the page you are on.
(make the page bigger) Ctrl and the + Key
(make the page smaller) Ctrl and the – Key
(make the page bigger) Hold the Ctrl Key and Scroll Up
(make the page smaller) Hold the Ctrl Key and Scroll Down
View > Zoom > Zoom In
View > Zoom > Zoom Out
One more zooming trick that Firefox has up its sleeve is the ability to only zoom in on text, leaving graphics their normal sizes. To do that, go to View > Zoom and select “Zoom Text Only”. To reset a page’s specific zoom level (large or small), go to View > Zoom > Reset or hit Ctrl and the 0 key. Firefox will remember which pages you have larger too. So for example, you could zoom into FirefoxFacts.com, but when you visit WebHostingShow.com, it would still be at its normal size. Your preferences are remembered for each site you visit.