Zoom text of web pages
From MozillaZine Knowledge Base
To change the text size of web pages, do any of the following
- View -> Text Size -> Increase/Normal/Decrease
- Ctrl++ (hold the control key and hit the plus key) makes the text larger.
- Ctrl+- (hold the control key and hit the minus key) makes the text smaller.
- Ctrl+0 (hold the control key and hit zero) makes the text normal size.
- Ctrl+scroll mouse wheel
These changes will only change text sizes temporarily. Tools -> Options -> Content -> Fonts & Colors gives you options that will stick.