Firefox V54.01 Lately when I play a youtube video I get no sound. Video portion is fine. I can see and hear the same videos on Chrome and IE with no difficulty. Windows 7 latest updates applied. I know I don't have the latest version of Firefox but the newer versions have messed up all my add-ons I disabled all add-ons. That made no difference. Will start a new post as suggested As requested i have posted this as a new thread in Malware section. " TonyT said: ↑ Disable all adds, don't uninstall them. Once all disabled see if youtube sound works. Then enable addons ONE at a time until the culprit is found. Problems like this are most usually caused by addons or extensions, even malware extensions. If no joy doing the above, start a new post in the malware forum."