My kids aren't at that stage yet, but whats to stop them from using a different browser? Chat programs use a different protocol too. I would think you would need software that looks at everything going "out the door" as opposed to limiting use of a specific program. Or are you more concerned with just limiting use during homework time sort of thing, in which case the family controls on Windows 7 is pretty powerful.
no what I want control is over content.... I'm home so they ask to go on so I know when they are on... I just want some sort of filter to keep everything pg-13..... I mistyped something the other day and ended up on a website that the image is still burned in my eyes and I'm 45...... I have a 14 and 12 year old and theres a lot of thing on the web I don't want them stumbling on.....
Keep in mind that it only works if you use firefox.
The one I use isn't just for Firefox. You can also limit the amount of time that is spent online.
OP asked about firefox add-ons. I gave her my results with what I used and just wanted to remind her that there are ways around it. My oldest would figure that out in a heartbeat and just use another internet browser. I think it really depends on how savvy your kids are. This is why I suggested the router option. They shouldn't be able to disable it unless they know the password to the router.
[disclaimer: I assume (yes I know the old saying about assuming things) this with the router because it seems to be router/web-based and does not rely on a specific program, browser or add-on. ]