Fix Image WebCache

Fixes Gmail image webcache for specified domains.

If you see broken images in your Gmail inbox, it could be caused by images pointing to your internal web server (e.g. Jira system) which Google is trying to cache. This extension helps to remove the Google image web cache and point the images directly to the web server. The extension will only work if you can open the images from your browser (i.e. you are connected to the internal network).