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The webapps just take a thumb of whatever image they can find on the page, can I customise it?

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For Gnome-Shell (Ubuntu 12.10), the image is located at ~/.config/epiphany/app-epiphany* (where the * in app-epiphany* is the web app name followed by and some additional numbers/letters)

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Additionally, you'll want to open the respective folder and edit the app-icon.png inside with gimp (or create a new one with inkscape then export it as a png). – airtonix Sep 30 '13 at 5:42

Try menulibre.

sudo add-apt-repository ppa:menulibre-dev/devel
sudo apt-get update
sudo apt-get install menulibre

Menulibre is really easy to use - hopefully it'll work with the webapps (it works with Unity-webapps). You can access it from the settings menu, or just type "menu" into the dash, and open the one called "Menu Editor."
Also, check out the developer's site here.

Menulibre Screenshot

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Replace the image files in ~/.gnome2/epiphany/app-epiphany* (where the * in app-epiphany* is the web app name followed by and some additional numbers/letters).

Then restart Unity (or GNOME Shell, if you're using that).


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