Current accessibility information can be found on Mozilla Firefox website here
Using a Keyboard
Always use the cursor keys to navigate within webpages allows you to move through web content as if you were inside a read-only editor. You can use the keyboard to select web content and copy it to the clipboard. You can enable this feature by selecting Tools > OptionsEdit > PreferencesFirefox > Preferences, opening the General tab in the Advanced panel, and checking the Always use the cursor keys to navigate within webpages optionpreference.
You can press F7 at any time to turn this feature on or off. When you press F7, Firefox will ask if you really want to turn on this feature. You can disable this prompt by selecting Do not show this dialog again.
Search for text when I start typing
Search for text when I start typing allows you to quickly navigate to text or hyperlinks in a web page. This feature has two modes. Press / and start typing to search all text on the current page, or press ' before your string to search hyperlinks only. Firefox will highlight matching text or hyperlinks as you type.
The following keyboard shortcuts control this feature:
- Type more characters to narrow your search. Firefox will highlight the next matching hyperlink or text or alert you that nothing matched.
- Press Ctrlcommand+G or F3 to find the next occurrence of your current search string.
- Press Ctrlcommand+Shift+G or Shift+F3 to find the previous occurrence of your current search string.
- Press Backspace to undo the last character you typed. Firefox will back up to the previously highlighted text.
- Press Esc to cancel a search. You can also cancel a search by changing focus, or simply waiting for the timeout.
You can change the default behavior of this feature by selecting Tools > OptionsEdit > PreferencesFirefox > Preferences, opening the Advanced panel, selecting the General tab, and checking the Search for text when I start typingoptionpreference. If this option is checked, you can start typing at any time to auto-start an inline search. By default auto-started searches look for all text on the page. You can still explicitly press ' or / to start finding in one mode or the other.
You can use this feature to get to buttons, text boxes and other form controls. Search for the text immediately before the form control you want and press Tab. Pressing Tab automatically exits the search and sets focus to the next form field or button after the highlighted text.
HTML Access Keys
On some web pages, keyboard shortcuts are assigned to different elements on the page. To move the cursor directly to one of these elements, press Shift+AltCtrl+AccessKey.
Which key AccessKey is depends on the website. It is determined by the website author, not Firefox.
Using a Mouse
Common Mouse Shortcuts
You can zoom in and out of pages including images, in the View > Zoom menu, or with the following keyboard shortcuts:
- Press Ctrlcommand+ + to display the web page one size larger.
- Press Ctrlcommand+- to display the web page one size smaller.
- Press Ctrlcommand+0 (zero) to display the web page at its normal size.
Browse With the Caret
Caret browsing is a way to navigate through webpages using only the keyboard by moving a text caret. A blinking cursor (the caret) is visible on all webpages allowing you to navigate through a page the same way that you might in word processor document. Credit: Accessibility.browsewithcaret mozillaZine Knowledge Base.
You can toggle this feature on/off by pressing F7. You can also set Firefox to always browse with the caret by going to Tools > Options > Advanced > General > Accessibility and tick the check box next to "Always use the cursor keys to navigate within web pages".
Fonts and Colors
Overriding Page Fonts
Some websites may display text in fonts that are difficult to read, and other sites may rely on the browser's default fonts. You can set your default fonts by going to Tools > OptionsEdit > PreferencesFirefox > Preferences, selecting the Contentpanel, and selecting a default font and size in the Fonts & Colors section.
You can specify default fonts for different styles, including serif, sans-serif, and monospace by clicking the Advanced button. However, many web pages specify their own fonts, so your choices will have no effect on such pages. To override the fonts defined by such pages, uncheck the Allow pages to choose their own fonts, instead of my selections above optionpreference.
Note that some web pages may display incorrectly depending on your choice of a default font.
Setting a Minimum Font Size
Some websites may display text which is too small to read comfortably. To make such pages easier to read, you can set a minimum font size. On web pages that try to display text smaller than this size, Firefox will enlarge the text to your chosen size.
To set a minimum font size, go to Tools > Options Edit > PreferencesFirefox > Preferences, select the Content panel, and click the Advanced button in the Fonts & Colors section. You can specify a minimum font size from the dropdown menu.
Note that some web pages may display incorrectly depending on your choice of a minimum font size.
Resizing Page Text
You can temporarily change the size of text on any web page in the View > Zoom menu, with Zoom Text Only enabled.
The following keyboard shortcuts control text size:
- Press Ctrlcommand++ to increase the text size.
- Press Ctrlcommand+- to decrease the text size.
- Press Ctrlcommand+0 (zero) to reset the text size to the web page's default size.
Note that some web pages may display incorrectly if you increase or decrease the text size.
Overriding Page Colors
Some websites may display text and background colors that are difficult to read, and other sites may rely on the browser's default colors. You can set your default colors by going to Tools > OptionsEdit > PreferencesFirefox > Preferences, selecting the Content panel, and clicking the Colors button in the Fonts & Colorssection. You can set default text and background colors, as well as default colors for visited and unvisited hyperlinks. You can also specify whether hyperlinks should be underlined.
However, many web pages set their own colors, so your choices will have no effect. To override the colors defined by web pages, uncheck the Allow pages to choose their own colors, instead of my selections above optionpreference.
Using a High Contrast Theme
Firefox automatically detects if you are using a High Contrast theme and displays everything in your high contrast color scheme. This overrides all other other browser or web page settings, and it affects the Firefox interface itself (all menus, windows, and dialog boxes) and the content of any web page you visit.
To use a High Contrast theme, go to Start Menu > Control Panel > Accessibility Options > Display and check the Use High Contrast optionpreference.