I am trying to zoom in on a tax map. When I get to around 300%, it begins to black out, and then it starts to crash in Firefox. I tried the same website on Safari, and it had no problems, so I know it is a Firefox issue. Not only does Firefox start to crash, it causes the pixels on my mac to stick to each other, glom together so to speak, and makes my computer funky and unresponsive. I just spent 45 minutes, at least, with Apple support in which they helped me clear my temporary files and speed up my iMac. They also helped me find that it was a Firefox issue by utilizing Safari to do a test run of zooming in on the tax map... I uninstalled Firefox and reinstalled...it is still having issues. And yes, I just updated Firefox, so I have the latest version.