This website has a built in tool that will enable you to enlarge the text. However if you find that the fully enlarged text size is not large enough, you can increase it still further using the tools available in your browser.
Click view, then highlight text size, go across and select the required text size.
Click view, then highlight text size, then go across and select the option to either increase or decrease text size, alternatively hold down Ctrl and press + to increase or − to decrease.
Warning: Some of the larger text sizes Firefox is capable of producing can cause overlapping text, if you require text this large you could try using a text magnifier.
These programs are designed to magnify on screen text. If you are using a Windows or Apple machine, there is one of these built in. Alternatively more powerful, commercial versions are available.
Windows Magnifier (Win 98+)
To start this program, open your start menu, select All Programs −> Accessories −> Accessibility −> Magnifier. This will leave you with a box at the top of the screen with the text around the cursor magnified.
Apple Universal Access
Mac Os X has a built in set of features called universal access. These are available through “system preferences,” which is located in the apple menu. On the ’seeing’ submenu click on the ‘Turn on Zoom’ button to access the text magnifier.