I can see there are some similar problems asked, but maybe not all the same and I would like to add some info to help the others, too. So, my problem: I can see youtube, vine, facebook, vimeo, dailymotion (slower than usual, it starts loading in 3-4 seconds) videos, but on the others, including porn, I've got problems. It can't load. Actually, it can, sometimes it loads after cca. 10 mins if I leave it like that. For the record, once it loads, it can be played in full screen, too. I tried literally everything I could find in last several hours, and since I usually solve all the software problems without googling I am confused now. I tried. - disabling plugins that might be conflicting - starting both mozilla (and refreshing it) and PC in safe mode - reinstalling flash, disabling acceleration of course - clearing personal data, both for flash and FF. - reinstalling Firefox, even with deleting all the private app data manually to get it clearest possible, however thanks to someone ingenious I can't do a clean reset, with all plugins removed. - checked if there are issues with Firewall or antivirus program, but disabling any of them, or both, doesn't do anything. I tried to install chrome and I've got the same problem, so it's not mozilla only problem, but still would like to get some ideas. On other devices connected to my network it works well. I appreciate any clue. UPDATE: I noticed the same issue when downloading a file from somewhere. Popup dialogue appears only when the file is completely downloaded then just saves it on the disk when I choose to. No download progress shown. I will be forced to reinstall the windows to fix it, but still I would like to know what can cause this kind of issue, to prevent it happen again.