esteid-browser-plugin: Update Mozilla extension compatibility versions
esteid-browser-plugin: Update Mozilla extension compatibility versions

Set Firefox 7, Thunderbird 7 and Seamonkey 2.2 as supported.

git-svn-id: 804e3bcc3d5e1f71d31da0afe626cb969e0fc117@3844 0d7e1ef0-d974-fc83-f0b3-ccc071561e0e

kalev/esteid-browser-plugin,kalev/esteid-browser-plugin,kalev/esteid-browser-plugin,kalev/esteid-browser-plugin,kalev/esteid-browser-plugin,kalev/esteid-browser-plugin