Can I stop websites from automatically playing videos?

[steve48]

Several news sites I read have popup videos in the lower right of the screen. Annoying. How can I stop the popup videos?

Here is an example: https://www.breitbart.com/video/2018/12 ... in-on-him/

I have media.autoplay.default set to 1. That stops popup videos on some web sites. But not all of them and not in the example above.

I have the Disable HTML5 Autoplay extension. Does not stop the popup video in the example above.

Anything else to do? Thank you.

[Brummelchen]

that pref is deprecated and replaced with v63, has been discussed here ago
http://forums.mozillazine.org/viewtopic ... &t=3042813
http://forums.mozillazine.org/viewtopic ... &t=3043733
http://forums.mozillazine.org/viewtopic ... &t=3042942

[costark]

that pref is deprecated and replaced with v63, has been discussed here ago
http://forums.mozillazine.org/viewtopic ... &t=3042813
http://forums.mozillazine.org/viewtopic ... &t=3043733
http://forums.mozillazine.org/viewtopic ... &t=3042942

None of the above links show a line I have whose Title SEEMS relevant to Stopping Media AUTO-PLAY .......

media.autoplay.block-event.enabled default boolean false

"block-event-enabled" True seems logical to Block Media Auto-Play - UNLESS it means "even IF I click to Play it".
How relevant is THIS line IF you want to Block Auto-Play BUT have the Choice to Clk & Play?
Setting True / false??

[jscher2000]

media.autoplay.block-event.enabled default boolean false

According to the following this most likely controls whether Firefox lets the scripts in the webpage know that autoplay was blocked by firing an event. https://utcc.utoronto.ca/~cks/space/blo ... SettingsII

[costark]

media.autoplay.block-event.enabled default boolean false

According to the following this most likely controls whether Firefox lets the scripts in the webpage know that autoplay was blocked by firing an event. https://utcc.utoronto.ca/~cks/space/blo ... SettingsII

For other readers ... From your link: [ "Firefox defaults it to off and I would leave it that way; presumably Mozilla knows what they're doing here."]

Thanks!

[Brummelchen]

I have the Disable HTML5 Autoplay extension

installed here either, but even with disable uBlock the video wont start until i click it.
there is probably more mismatch in your profile than visible.

[costark]

media.autoplay.block-event.enabled default boolean false

According to the following this most likely controls whether Firefox lets the scripts in the webpage know that autoplay was blocked by firing an event. https://utcc.utoronto.ca/~cks/space/blo ... SettingsII

For other readers ... From your link: [ "Firefox defaults it to off and I would leave it that way; presumably Mozilla knows what they're doing here."]

Thanks!