Firefox add-on with keyword - rule

Prevent eye strain with the 20-20-20 Rule reminder.

With a simple mouse-over you can enlarge images and display images/videos from links.

Simple tool for measuring arbitrary parts of a page. Does not and will never contain adware.

Unmatched adblock extension against advertising and pop-ups. Blocks ads on Facebook, Youtube and all other websites.

A very dark Persona to show how the world is ruled by one little fox.

Measure page elements size in pixel with an easy-to-use ruler.

Removes all Ads and banners with simple regular expression rules.

Finally, an efficient wide-spectrum content blocker. Easy on CPU and memory.

Customize web requests by coding JavaScript yourself.

Create rulers and grids overlays to help develop your web applications

Draw a grid view, get page dimensions in pixel (px) unit and draw a rule

vinyl really rules !

Advanced Feed Reader - Read news & blogs or any RSS/Atom/RDF source.

Add a ruler below your mouse to help read long lines. Fired by ctrl+click

Highlights the line of text you are reading.

rule34 firefox theme lol

Removes tracking elements from URLs

A ruler for measure something in a website. Just press Alt button in a website and move your mouse.

一款支持吸附页面元素的网页测量工具

The one ring to rule them All!

An easy-to-use tab reloader with custom reloading time settings for individual tabs

Download files with Internet Download Manager

SmartProxy is a smart automatic proxy switcher that will automatically enable/disable proxy for the sites you visit, based on customizable rules.

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Calulate rule of 3 math problems effortlessly!