Firefox includes more accessibility features than most users realize. Whether you have permanent accessibility needs, temporary disabilities, or just want to reduce eye strain and improve usability, Firefox's built-in tools are worth knowing.
Screen Reader Support
Firefox has strong support for screen readers on all platforms:
Windows: NVDA (free, open source) and JAWS both work well with Firefox. Mozilla actively tests Firefox with NVDA and funds accessibility work.
macOS: VoiceOver works with Firefox. Safari historically had better VoiceOver integration, but Firefox has improved significantly.
Linux: Orca screen reader (GNOME's screen reader) integrates with Firefox via AT-SPI2, the Linux accessibility stack.
To enable a screen reader, you typically don't configure Firefox directly — you enable the screen reader in your OS, and Firefox responds to it via accessibility APIs.
Developer tip: Use Firefox's Accessibility Panel (DevTools → Accessibility tab) to inspect the accessibility tree of any page. This shows how screen readers see the page.
Keyboard Navigation
Firefox is fully keyboard-navigable without a screen reader:
Tab: Move focus through interactive elements (links, buttons, forms)
Shift+Tab: Move backwards
Enter/Space: Activate focused element
Arrow keys: Navigate within components (menus, selects, radio groups)
Tab focus on all elements (including non-interactive elements like divs):
In Settings → General, there's a "Use cursor keys to navigate within pages" option, or use:
- F7: Toggle Caret Browsing mode — puts a text cursor on the page so you can navigate with arrow keys like a text editor
This is particularly useful for users with motor impairments who find mouse targeting difficult.
Caret Browsing
Caret Browsing deserves more attention. Press F7 to toggle it.
In Caret Browsing mode:
- A text cursor appears on the page
- You navigate with arrow keys, Page Up/Down, Home/End
- Shift + arrow keys selects text
- Works like a document editor
This makes it much easier to read and navigate long pages without a mouse. It's also useful for precise text selection on complex pages.
Zoom Controls
Firefox has two zoom systems:
Page Zoom (Ctrl+/Ctrl-): Scales everything on the page — text, images, layout.
- Default zoom: Settings → General → Zoom
- Remember zoom per site: enabled by default
- Reset: Ctrl+0
Text-only zoom: View menu → Zoom → Zoom Text Only
- Only enlarges text, not images or layout
- Useful when the layout zoom breaks page structure
Minimum font size: Settings → General → Fonts → Advanced → Minimum font size
- Forces all text to be at least N pixels, even if the page specifies smaller
- Good for pages that use tiny text that resists zoom
Color and Contrast
Override page colors: Settings → General → Colors
- Firefox can force its own text and background colors on all pages
- Useful for high-contrast mode
- Options: Use system colors, always use Firefox colors
High contrast mode: If Windows/macOS high contrast mode is enabled, Firefox respects it by default. Pages can be forced into high contrast via the color override settings above.
Forced colors: Firefox 107+ respects CSS forced-colors media query, allowing websites to detect high-contrast mode and adapt their styles.
Reduced Motion
Firefox respects prefers-reduced-motion CSS media query automatically if you have reduced motion enabled in your OS:
- Windows: Settings → Ease of Access → Display → Show animations
- macOS: System Preferences → Accessibility → Display → Reduce Motion
-
Linux (GNOME): Accessibility settings or
gsettings set org.gnome.desktop.interface enable-animations false
When reduced motion is set, animations on websites that respect it will be minimized or eliminated. This helps users with vestibular disorders, migraines, or attention disorders.
You can also force this in about:config:
ui.prefersReducedMotion = 1
Reading Mode
Firefox's Reading Mode strips away navigation, ads, and sidebars from articles, showing just the content.
To activate: Click the book icon in the address bar (appears on article-type pages), or press F9.
In reading mode:
- Adjust font size (Aa button in toolbar)
- Choose serif or sans-serif font
- Select background color: white, sepia, dark
- Adjust line spacing and column width
- Listen to the article with text-to-speech (TTS)
Text-to-speech in Reading Mode:
The headphone icon in Reading Mode controls starts reading aloud. This uses the OS TTS engine, so voice quality depends on your system. Speed and voice can be adjusted.
Firefox Accessibility DevTools Panel
For developers and QA testers, the Accessibility panel is invaluable:
Open DevTools (F12) → Accessibility tab
Features:
- Accessibility tree: Visual tree showing how screen readers see the page
- Properties: Accessibility properties of selected element (role, name, description, states)
- Check for accessibility issues: Automated scan for common issues (missing labels, poor contrast)
- Simulate: Simulate various visual impairments (protanopia, deuteranopia, tritanopia, achromatopsia, contrast loss, blurred vision)
The color simulation feature is particularly useful for designers — switch to "Protanopia" view to see how your page looks to users with red-green color blindness.
Mouse and Pointer Settings
For motor accessibility:
Cursor size: Controlled by OS settings, but Firefox respects system cursor.
Click-lock: Enable in Windows Ease of Access — allows dragging without holding the mouse button.
Mouse dwell click: Third-party tools like Gnome-Mousetrap allow clicking by hovering — Firefox works fine with these.
Extensions for Accessibility
Voice Control: Dragon NaturallySpeaking / Voice Control on macOS works with Firefox.
Accessibility extensions:
- Zoom Page WE: Finer-grained zoom control, per-element zoom
- Dark Reader: High-contrast dark mode for all sites (also helps with migraines/photosensitivity)
- Open Dyslexic: OpenDyslexic font injection for users with dyslexia
- Bionic Reading: Bolded word beginnings for faster, easier reading
Summary
| Feature | How to access |
|---|---|
| Caret Browsing | F7 |
| Page Zoom | Ctrl+/Ctrl- |
| Text Zoom | View → Zoom → Text Only |
| Reading Mode | F9 or address bar icon |
| TTS in Reading Mode | Headphone icon in Reading Mode toolbar |
| Force colors | Settings → General → Colors |
| Min font size | Settings → General → Fonts → Advanced |
| Accessibility DevTools | F12 → Accessibility tab |
| Reduced motion | OS setting or ui.prefersReducedMotion in about:config |
Firefox doesn't advertise these features as loudly as some competitors, but the underlying accessibility support is strong and kept up-to-date.
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