Redo your prefixes and suffixes for version 0.6.0
I changed the names of the preferences to be inline with the Mozilla naming convention but this does mean that you will need to re-enter your customizations for the prefixes and suffixes. Sorry for the inconvenience.
Continuation Mod Merged
All changes from the URL Suffix - Continued modification have been merged back to this version, rendering the continuation extension obsolete. All updates will now again be done here.
Disabled Alt-Enter New Tab Opening
It should also be noted that when using "URL Suffix" in combination with "Tab Mix Plus" the default Alt-Enter key combination's function to open in a new tab is disabled. This is done in the "Tab Mix Plus" add on, when it detects that "URL Suffix" is installed. "URL Suffix" does not alter any tab behavior since it is out of scope of the add on. "URL Suffix" only adds prefixes and suffixes to your already typed URL bar.