It works pretty well and is doing everything it says.
It's really good written.
But there's ONE thing that bothers me...
It looks very very ugly. It should look like this: http://puu.sh/pDz6
An easy drag-and-drop window, take 4chan X' Thread Watcher or various 4chan Filters.
Please tell me you continue working on this script and if it is possible for you.
Also, the script should autoload, pressing the "Checking" button everytime you load a thread can be annoying.