Useful AND Perfect! Rated 5 out of 5 stars
This light add-on works like a charm in FF3. Concerning the missing text for "Fetch in new tab", you'll have to do ONE surgical modification. Go to your Firefox\Profiles folder, find ftu.jar in the sub-folders and unzip it. Then find ftu.js and edit it. Find "onPopupShowing" and insert a line before "var selected;" : "gContextMenu.isTextSelected;".
Now save it, close Firefox, select both "content" and "skin" folders and zip them as "ftu.zip". Finally replace original ftu.jar by this new ftu.zip (rename it ftu.jar). Launch Firefox and enjoy the text!