Ignore tags file
Add completion_items option

It supports the following options: history, bookmarks, search. Any could
be added and in any order and then results from completion will be
filtered and ordered accordingly. Example usage:
set completion_items=bookmarks,history,search
Fix Url.parent to work when URL ends with /
Pass tab from frontend to background as a property

Not as the last argument
Rename newtab to newTab
Export global functions in a different way
Do not add "http" to URLs as the site may be https
Minor refactoring
Add url and search-engine completion items
Save less information for last closed tab
Minor refactoring
Remove a useless setTimeout
Do add 'http' in front of URLs

As otherwise Chrome will open some strange extension page...
Prevent opening more than one time a link

If the user types too fast, she could open a specific link via a hint
multiple times. This should prevent that from happening
Refactoring and minor optimizations
Fix dialog box race condition
Refactoring and minor optimizations of getKey
Add a comment to explain need for rabs
Fix some issues and optimize a bit search
Forgot to rename a variable