Hi, You can use the Grease Monkey Tool.
yes 
i agree. this is the best way for anyone to make up their mind. trial versions of web based or desktop apps are the best to shed some light on the utility - cost balance
Since another moderator has already addressed the sig issue in this post, I won’t pile on with another infraction, but you’re hijacking a thread for your own purposes, and you’re asking a tremendously generic and broad question that can best be answered by your own efforts – reading the threads, the stickied posts that give a grounding in fundamental techniques, and so forth.