See if you have the latest version, Joe. I use Adblock and have no problems. Indeed, the only problems I do have is occasionally I have to switch it off to view content, as the advert is smacked on the front of the video that I want to view. The SKY website does that. Also, check your computer through with CCleaner or EasyCleaner.
Tbh, I was expecting a clutch of members coming on here today saying they had gremlins on their computers after having visited this site yesterday, and specifically after clicking onto -DTLW's [now deleted] thread which provided a link to watch the whole 90 recorded minutes of yesterday's match against Palace. Whilst, if you downloaded and installed the necessary software, you would have been able to see it, it came with an army of malware which you certainly didn't want. I had to check it out, at top speed, without infecting my own computer [it did, but I quickly killed the gremlins] as I use no protection on my PCs except Ghostery and Ad-Block plug-ins. Other, less techie, members may have fallen foul of all this stuff. Fingers crossed I deleted the thread before those significant others went for the bait.
EDIT: And -DTLW has learned his lesson.

And by the way, I use Firefox as well.