Below is a list of several third party extensions for Epiphany. If you know of any other extensions (yours or otherwise), please email me.
As this list grows, this page in the future may evolve into some sort of interactive list where you can upload your own extensions. Right now, this is probably not organized in the best way possible. I would also appreciate feedback for suggestions on how to better categorize extensions to fix this.
Courtesy Stefan Stuhr.
This extension has several purposes. The first is to get rid of the close buttons on all tabs. The second is to make the tab width more flexible; instead of a fixed width they will scale, so that there will first be overflow with many tabs open. The third is to make a close button available as a toolbar button.
Courtesy Stefan Stuhr.
Undo closing of tabs.
Courtesy Stefan Stuhr.
A simpler way to choose which tab to focus after closing another. The default in Epiphany is to fucus the last focused tab. With this extension, it will focus the tab to the right of the closed tab (if any; if not, it will focus the tab to the left).
Courtesy Stefan Stuhr.
Less border around tab labels. Sets the border to 1 pixel.
Courtesy Stefan Stuhr.
Set URGENT window manager hint when content changes in a window that doesn't have focus.
Courtesy Stefan Stuhr.
Another simpler way to choose which tab to focus after closing another. The default in Epiphany is to fucus the last focused tab. With this extension, it will focus the tab to the left of the closed tab (if any; if not, it will focus the tab to the right).
This extension is almost the same as the Simple Tab Close Focus extension, except that its behaviour is reversed.
Courtesy Stefan Stuhr.
Use the tab key (Ctrl+Tab and Ctrl+Shift+Tab) to navigate between tabs.
Courtesy Stefan Stuhr.
Close tabs by clicking on them with the middle mouse button. Also disables switching between tabs by scrolling over the tab bar with a mouse scroll wheel.
Courtesy Christian Persch.
Hides the tab close buttons on non-focused tabs.
Courtesy Stefan Stuhr.
Put the menubar and toolbar beside each other. There are some issues with customizing toolbars while in this mode; deactivate this extension when you want to do that.
Courtesy dieguito
This extensions gets the throbber (the icon that moves funny as you load a website) from the toolbar, now it gives your throbber back when you unload it (I promise ll return all the throbbers I kept for myself).
Courtesy Christian Persch.
The "alt-d" extension adds ALT-D as shortcut to focus the location entry, for people who're not yet over their IE habit.
Courtesy Christian Persch.
The "window-icon" extension sets the active tab's site icon as window icon, in the same way as Epiphany versions <= 1.8 (this misfeature was removed from versions >= 1.9).
Courtesy Gustavo Gama.
I remember seeing a couple of messages at #epiphany or epiphany@gnome.org asking about how one might be able use the session recovery feature after a clean exit. I decided to give it a try and write an extension that does just that. It required a few changes to Epiphany's shell startup code, so it's certainly not the cleanest design, but it's a start.
Courtesy dieguito
This extension will behave as this one for Firefox. It allows you to see in the statusbar what the software being used by the server of the current page is.
Courtesy dieguito
This extension allows you to view the page source using gecko's view-source: urls, it now overrides the default epiphany Control+U shortcut so you can rely on it when using this extension.
Courtesy Magnus.
Epilicious is an extension for the Gnome web browser Epiphany. It lets you synchronise your local bookmarks with the bookmarks in a Delicious account. It still quite rough around the edges, but fully usable. As always, use at your own risk!
Courtesy Vaclav Smilauer.
Allows one to use keyword-like shortcuts a la Galeon to simplify searching.
Courtesy Reinout van Schouwen and Wouter Bolsterlee.
Prevents particular sites from using fonts other than the ones that you want to use.