Official Epiphany Extensions
You can install official Epiphany Extensions as a package (normally called epiphany-extensions) from the package manager of Your operating systems. They are installed with gnome meta package by default.
Actions
Execute arbitrary commands from context menu
Ad Blocker
Block the pest!
Auto Reload Tab
Reload a tab periodically.
Note: local pages are reloaded automatically on file change.
Certificates
View the page certificate and manage the certificates.
Gestures
Perform actions with mouse gestures.
Greasemonkey
Run Greasemonkey scripts - user scripts to modify web pages' behaviour. You can get the scripts from the official repository.
HTML5Tube
Allows to view Youtube videos using WebKit's HTML5 media player instead of the default Flash-based player used otherwise. You need to HTML5 test in order to use this extension.
News Feed Subscription
Subscribe to a news feed offered by the webpage in your favorite news reader.
Push Scroll
Drag the page on middle mouse click.
Soup Fly
A tool to debug the SoupSession WebKit uses.
Tab Key Tab Navigate
Use the Tab key to navigate between tabs.
Tab States
Indicates new content in background tabs by making tab titles bold.