steamgifts plus issue

Power cable on my normal laptop died on me so I'm having to use my secondary laptop for the time being (said laptop is getting on towards 7 years old, so yeah, it's good only for web browsing). Tried to get Steamgifts plus installed and it just isn't seeming to pick up that I have the script. Under account where the steamgifts plus option would show it's not there and I don't get the option to filter so now every giveaway I'm seeing is stuff I own since we're being spammed with Bethesda new years collection and Indiegala stuff.

Using Firefox 5.0.1 in Windows XP. The computer I was using previously runs the same version of Firefox, just in Windows 7 and with a few additional add ons. And please don't tell me to use Chrome, this computer and Chrome don't get along at all.

Only add ons I have besides greasemonkey are noscript, ad block plus, tab mix plus, tab counter, session manager, lj login and screengrab. Honestly, nothing I don't have on the other computer that it works fine on.

I tried to disable and renable the script and greasemonkey and restart the browser. All the add ons are updated as well. Is there something else I may be missing that is required to run the script?