After some problems with the addon and its configuration, i've got some great support from Martin via e-mail. Now the plug in works with yourls 1.7.3 on my private server.

Broken and unsupported. Don't bother.

404 Not Found when trying to get an URL/signature

The plugin is broken if e10s is enabled. But works fine as long as its disabled.

As another reviewer noted, 1.5 was broken. I was unable to get 1.6 to work, although an older versions served me well for a long time. I just made a new install of 1.7, and I can't get it going, either. I've sent an email to "Ozh," but I've not had a response.

The extension itself ist really great and worked like a charm.
Unfortunately the version 1.5 is broken and just gives me the error TypeError: gContextMenu is null in line 90. Back to 1.4 which still works.

Works perfectly , thanks!

I never imagined could exist, but I found it. Works fine in Firefox 12. Let's see if the developer is encouraged to do so for Chrome. Congratulations.