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Accessibility features in Firefox - Make Firefox and web content work for all users
Firefox includes many features to make the browser and web content accessible to all users, including those who have low vision, no vision, or limited ability to use a keyboard or mouse.
Table of Contents
Using a Keyboard
A list of common keyboard shortcuts is available in Keyboard shortcuts - Perform common Firefox tasks quickly.
Using a keyboard to navigate within webpages
When you go to the Firefox menu
and select
Settings
, the General panel Browsing section includes the setting Always use the cursor keys to navigate within webpages. This 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 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 you start to type
Your Firefox Settings General panel Browsing section includes the setting Search for text when you start typing. This 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:
If this setting is checked, you can start typing at any time to auto-start a search on the current page. 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
+
Alt
+AccessKey.
Which key AccessKey depends on the website. It is determined by the website author, not Firefox.
Mouse Shortcuts
A list of common mouse shortcuts is available in Use mouse shortcuts to perform common tasks in Firefox.
Zoom, Fonts and Colors
Page Zoom
You can zoom in and out of web pages including images with the following keyboard shortcuts:
For other ways to zoom in and out a web page, see Font size and zoom - increase the size of web pages.
Text Zoom
You can choose to change the text size only using the Text Zoom feature:
  1. Press the
    Alt
    key to temporarily bring up the traditional Firefox menus. At the top of the Firefox window, click the View menu, then go to Zoom.
  2. Select Zoom Text Only, which will make the controls only apply to text, not images.
The following keyboard shortcuts control text size when Text Zoom is selected:
Note that some web pages may display incorrectly if you increase or decrease the text size.
For other ways to zoom in and out the text of a web page, see Font size and zoom - increase the size of web pages.
Setting Fonts and Colors
See Change the fonts and colors websites use for detailed instructions on choosing your preferred font styles and colors.
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, open the Firefox menu
and select
Settings
. In the General panel, go down to Language and Appearance 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 minimum font size.
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. To set your default fonts:
  1. Click the menu button
    and select Settings.
  2. In the General panel, scroll down to Language and Appearance.
  3. Choose 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 your selections above option.
Note that some web pages may display incorrectly depending on your choice of a default font.
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. To set your default colors:
  1. Click the menu button
    and select Settings.
  2. In the General panel, scroll down to Language and Appearance.
  3. Click the
    Colors…
    button in the Fonts & Colors section.
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 option.
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 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, open the charms panel, select Control Panel from the Settings charm, then Appearance and Personalization, finally Change the theme and choose one of the High Contrast themes.
Controlling Web Content
Blocking Pop-up Windows
See Pop-up blocker settings, exceptions and troubleshooting for information on blocking pop-up windows.
Restricting JavaScript Behavior
JavaScript can be used to do things that some people don't like. For better control, you can install privacy extensions. For more info, see JavaScript settings and preferences for interactive web pages.
Compatibility With Assistive Technologies
Screen Reader
A screen reader is a software application that attempts to identify and interpret what is being displayed on the screen (or, more accurately, sent to standard output, whether a video monitor is present or not). This interpretation is then re-presented to the user with text-to-speech, sound icons, or a Braille output device. Screen readers are a form of assistive technology (AT) potentially useful to people who are blind, visually impaired, illiterate or learning disabled, often in combination with other AT, such as screen magnifiers. The above was adapted from Wikipedia under the Creative Commons Attribution-ShareAlike 3.0 license.
Here are a list of screen reader software and links to common ones:
Finding useful Links to do with accessibility
Access Firefox website contains many useful links.
To Find out more about Mozilla Accessibility visit Mozilla Accessibility on MDN.

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These fine people helped write this article:
AliceWyman, Chris Ilias, Ken Saunders, jscher2000, MarcoZ, Cheng Wang, Tonnes, Michele Rodaro, Aleksej, David (satdav), Michael Verdi, scoobidiver, Swarnava Sengupta, mluna, user669794, Lan, Joni, Artist, Cécile, hebgehogg, Fabi

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