Toggle Browser Settings от cubeleco

Supports toggles for the following Firefox settings: Overriding document colors, overriding document fonts, site specific zoom, and image animations.

The toggles for the settings are in the launcher menu (right click the toolbar icon) and the Tools menu. (Alt-t)
Keyboard command shortcuts are also able to be set. (about:addons > gear icon > Manage Extension Shortcuts) The toolbar icon can be clicked to toggle each setting: If no modifier key is held document colors toggles, Shift toggles document fonts, Ctrl toggles site specific zoom, and Shift+Ctrl toggles image animations.

Similar Extensions:
<a href="https://addons.mozilla.org/en-US/firefox/addon/privacy-settings/">Privacy Settings</a>
<a href="https://addons.mozilla.org/en-US/firefox/addon/toggleglobalcolors/">Toggle Website Colors (Global)</a>