Question

What I’m trying to do is load Facebook.com in safari, except with my added javascript which regularly checks for received chat messages and translates them.
How do I got about this without making a safari extension, or using grease kit?
I guess what I need to do is load Facebook.com, but with my script tacked/”injected” in the head of the document…

Answer 1

I can’t speak for Safari, but in Firefox there is a marvelous addon called GreaseMonkey that does exactly what you want: execute arbitrary JS of your choosing/creation on arbitrary websites. I use it on google to keep down their tracking of my clicks.

Update:

I don’t know why you have these constraints. Not using GreaseMonkey means doing a huge amount of work, and for what purpose? I suppose you could use any one of a number of proxy servers and have it do this for you automatically, but that would mean:

1. Finding and setting up the server.
2. Running all of your requests through it. This is not only slower, but it also may play havoc with things like streaming video, etc.

Bottom line: You can’t change Safari itself so you either use an existing addon, make one yourself (no easy feat), or use a proxy. Life is too short as it is, so go grab GreaseMonkey and be done with it.