KDE Activities wót Scheirle

Adds rudimentary support for KDE Activities.

Opening a link (from an external application) will now always open this link in a Firefox window on the current Activity. This is done by moving the tab to either a new window or an already existing window on the current Activity.

This Add-on consists of two parts, the Firefox Add-on and a native component. The native component is required to know what window is on which Activity.

The native component has to be installed separately!
Visit https://github.com/Scheirle/KdeActivitiesFirefoxAddon for more information.