This extension can simplify the rule to just specify the URI and Content type and can enable/disable each rule separately.
What's more, it can customize the web pages by user scripts which is similar to Grease Monkey.
Foundstone HTML5 Local Storage Explorer allows for viewing, modifying and deleting of data items stored in the browser's LocalStorage. LocalStorage is a client side storage technology introduced in HTML5.
Link Password - Password Protect System For Bookmarks And Links.
Do you sometimes need, and password-protect individual bookmarks or link.
Perhaps a link to a secret site that no one else will be able to follow.
Clears the search bar after you perform a search, getting the old query out of the way. Useful for quickly pasting text into it, or for keeping your most recent query hidden.
Detects and resets changes to settings that are frequently done by add-ons and application installers.
Adds option in Privacy settings to auto-clear the Searchbox. (Option disabled by default)
Adding this option in privacy setting will allow users to decide whether the user wants to clear the text on search or not from search bar.
Disable a Firefox feature of remembering site-by-site download destinations.