Greasemonkey
What Are GM Scripts?
You can use Greasemonkey scripts in FireFox if you have the Greasemonkey add on.
Definition of Greasemonkey: Wikipedia "... Greasemonkey is an add-on to Firefox that allows "scripts" to be run on selected webpages, to alter the way they are displayed."
List of Twilight Heroes Greasemonkey Scripts
Put a Rest Link on the Top Pane after Somerset- http://xtraterrestrial.googlepages.com/restlink.user.js By Sounos
XP bar(to level 31)- http://xtraterrestrial.googlepages.com/LevelBar.user.js By Sounos
Stationary Combat Buttons- http://xtraterrestrial.googlepages.com/stationarycombat2.user.js By Sounos
Manage Outfits- http://xtraterrestrial.googlepages.com/THoutfits.user.js By Sounos
Links to Heal HP/MP at the Space Station- http://xtraterrestrial.googlepages.com/radiationsickbay.user.js By Sounos
Chat Menu in your Bottom Pane bar- http://www.twilightheroes.com/forums/viewtopic.php?p=6846#6846 By Dadaca
Label Mods- http://userstyles.org/styles/4699 Amanda Kerik
