Separate automatic start from a deliberate play action
Record what happened before the video started: opening the page, returning to a tab or pressing its play control. Also record whether the player was muted. These observations describe the event more usefully than saying Firefox ignores audio settings.
Use a short, identifiable page for any comparison and keep its site name in the note. Autoplay is a start-permission question. It is different from the programme having an audio track, the tab being muted or the computer sending sound to an unexpected output.
Read the default policy actually saved
In Firefox Settings, find Autoplay using the settings search or the Permissions area described by Mozilla. Open its Settings dialog and inspect Default for all websites. Mozilla documents Block Audio, Block Audio and Video, and Allow Audio and Video.
The first blocks automatic media with sound; the second also blocks muted autoplay; the third permits automatic audio and video. Choose the policy that matches the viewer’s task and select Save Changes. A muted animation continuing under Block Audio is not the same observation as audible speech starting under that setting.
Check whether this site overrides the default
Mozilla states that specific site settings take precedence over the default. When Firefox actively blocks autoplay, its special address-bar icon opens a permissions panel with that site’s Autoplay choice. The saved autoplay settings list provides another place to inspect exceptions.
Before changing the general default, look for an existing exception for the page being checked. Record its exact value. A controlled comparison can alter only that site and then restore the intended choice; there is no need to make unrelated sites start automatically merely to learn whether one saved exception explains the result.
Keep the result narrow and reproducible
After saving, repeat the same page action and note sound, mute state and whether manual Play works. If manual playback still fails, preserve that separate symptom. Autoplay permission alone does not establish support for the media format or prove the player has received a usable source.
No Firefox session was exercised for this article. The policy definitions and interface routes follow Mozilla’s current help, while the comparison sequence is a suggested way to document the actual browser. Keep useful accessibility or household preferences in place after the check.
Sources and scope
Scope notes distinguish published documentation, supplied information and editorial methods. They do not report a hands-on service test.
- Mozilla: allow or block media autoplay — Official full body: three policy definitions, settings search, Save Changes and site-exception precedence. Diagnostic sequence is proposed, not a performed browser test.
