userstyles.org - Twitter (new style) - replace Helvetica with Arial

To use this style, install Firefox and Stylish. If you already have Stylish, make sure this site is allowed to run JavaScript.

Did you know Firefox is available on Android? You'll need that and Stylish to use this.

Did you know Firefox is available on Android? You'll need that and Stylish to use this.

✓ Style installed! Need help?

✓ Style installed! Need help?

✓ Style installed! Need help?

✓ Style installed!

To use this style, install Stylish with Smartest Bar (or install just Stylish).

(Though installing Stylish is recommended, Greasemonkey users can also install this style as user script.)

To use this style, install Firefox and Stylish.

(Though installing Stylish is recommended, IE7Pro users can also install as a user script.)

To use this style, install Stylish.

(Though installing Stylish is recommended, you can also install as plain CSS or install as user JS.)

To use this style, first install Stylish.

(Though installing Stylish is recommended, TamperMonkey users can also install this style as user script.)