See: *https://support.mozilla.org/en-US/kb/block-autoplay ---- You can look at these prefs on the the <b>about:config</b> page to see what settings work for you. These settings are for blocking auto-play. If these are too strict then you can change some or reset them if they are bold. *media.autoplay.default = 5 [0:allow;1:blockAudible;2:Prompt;5:blockAll] *media.autoplay.blocking_policy = 2 *media.autoplay.allow-extension-background-pages = false *media.autoplay.block-event.enabled = true You can open the <b>about:config</b> page via the location/address bar. You can accept the warning and click "I accept the risk!" to continue. *https://support.mozilla.org/en-US/kb/about-config-editor-firefox

have any way just block auto play video why block video have to block audio first