On 2015-10-10, Felix Miata <mrma...@earthlink.net> wrote: > >> Seems there is a boolean option for Firefox versions 8 and above that >> can be toggled (about:config in the address bar) > >> plugins.click_to_play > >> which may satisfy your needs. > >> https://security.berkeley.edu/faq/web-browsing/how-do-i-enable-click-play-mozilla-firefox > > What is there for HTML5 video, which isn't a plugin? > http://finance.yahoo.com/news/cramer-why-im-rethinking-view-221140224.html > plays on load, even though I have NoScript defaulting to JS disabled, until I > click its pause button.
You can set the media.autoplay.enabled preference to false, though that won't stop all HTML5 video from playing, apparently. A bug was filed concerning this issue https://bugzilla.mozilla.org/show_bug.cgi?id=659285, but it has yet to be completely resolved (it seems).