Firefox for Android gives you the option to turn off web fonts to speed up your browsing or use less data.
Here's how to do it:
- Tap the menu button (either below the screen on some devices or in the upper right of the browser) .
- Tap (you may need to tap first) .
- Tap .
- Tap the switch next to Show web fonts to enable it. Toggle the switch to disable it. Your changes will be saved automatically.