Weird grey box across my computer screen

[Hazy992]

It's happened at least twice now; a grey box about 2'' across moves across the screen for less than a second and then disappears. Does anyone know what it could be? It always seems to be when I'm running Firefox

 

[Hazy992]

Ok it's just happened again. It happened three times in a row and I have no idea what it could be. Does anyone know?

 

[JesterRaiin]

Ok it's just happened again. It happened three times in a row and I have no idea what it could be. Does anyone know?

- Try launching Firefox in "safe mode" (with all extensions disabled)
- Try different Internet Browser (Opera, Chrome), and see if the grey box appears.

 

[Hazy992]

Ok it's just happened again. It happened three times in a row and I have no idea what it could be. Does anyone know?

- Try launching Firefox in "safe mode" (with all extensions disabled)
- Try different Internet Browser (Opera, Chrome), and see if the grey box appears.

It hasn't done it since so it's kinda difficult to know if it's gonna happen again. I've disabled an add on I'd just reinstalled. Pretty sure the last time it happened I'd just installed it. Think it could be that? I forgot about it until now

 

[JesterRaiin]

It hasn't done it since so it's kinda difficult to know if it's gonna happen again. I've disabled an add on I'd just reinstalled. Pretty sure the last time it happened I'd just installed it. Think it could be that? I forgot about it until now

It's possible. Some add-ons have more flaws than entire plot of Star Wars prequel trilogy. ;]

 

[Hazy992]

It hasn't done it since so it's kinda difficult to know if it's gonna happen again. I've disabled an add on I'd just reinstalled. Pretty sure the last time it happened I'd just installed it. Think it could be that? I forgot about it until now

It's possible. Some add-ons have more flaws than entire plot of Star Wars prequel trilogy. ;]

If it doesn't happen again I'll assume it's that. I'm doing a scan with Super Anti-Spyware just in case. Thanks for your help