Go to the View menu using your mouse or by pressing Alt + V.
Select the Text Size option using your mouse or by pressing X.
Choose your preferred text size using your mouse or by using the up and down arrow keys and pressing Enter or by clicking on it.
Firefox
The following instructions will set the minimum font size on your computer’s system, so the size will apply to every site you visit.
Go to Tools in your browser’s menu using your mouse or press Alt + T.
Click on Options, or press O, to open the Options dialog box.
Select General if not already selected or press the tab key until it is highlighted (in blue) and then press Enter.
Click on Fonts & Colors, or press F, to open the Fonts and Colors dialog box (see example below).
Click on Minimum font size box or press Alt + Z. Use the cursor keys (up and down arrows) to select a new font size and press Enter.
Click on the Always use my: Fonts checkbox, or tab to it and then press the spacebar.
Click the OK button or press Enter.
Click the OK button or tab to the OK button and press Enter.
For more information on help with seeing websites including using screen magnifying software, making your mouse pointer easier to see and using your own style sheets amongst other useful tips, go to the BBC My Web My Way website at http://www.bbc.co.uk/accessibility/win/seeing/sub_1.shtml (new window)