Seems extension no longer maintained - causes Enter not working Rated 2 out of 5 stars
Seems extension is no longer maintained. Did work previously. Now with FF 15 there are two major problems:
1. connecting ...
As other users reported already.
2. Enter not working in Address bar.
This extension causes ENTER key not working at all. After entering anything (URL, search expression etc) and hitting enter nothing happens. Even the arrow button in the address bar won't work. It took me a while to figure out this one.
The latest update to IE Tab 2 is revealing a bug in Tab Mix Plus where all tabs will just say "Connecting..." and the enter key won't work.
Sorry for the inconvenience.
IE Tab 2 author has published a fix which can be found here: