To stop Firefox autoplay videos completely, open Settings, go to Privacy & Security, and set the Autoplay default to “Block Audio and Video.” That single change prevents all media, including muted videos, from starting on their own, so you can browse without sudden noise or motion.
Blocking all autoplay in Firefox settings
- Open the Firefox menu (three horizontal lines in the upper-right corner) and select “Settings” (or “Preferences” on macOS).
- Choose “Privacy & Security” from the left sidebar.
- Scroll down to the “Permissions” section and click the “Settings…” button next to “Autoplay.”
- In the “Default for all websites” dropdown, select “Block Audio and Video.”
- Click “Save Changes” to apply the new default.
This setting overrides Firefox’s built-in behavior, which only silences noisy videos. With “Block Audio and Video,” even videos that start muted will not play until you click them, giving you full control over every page you visit.
Understanding Firefox's default autoplay blocking
Firefox’s default “Block Audio” setting stops only media with sound from playing automatically. That means a video with the sound off can still start and move across your screen, which is distracting even without audio. You might want to change this if you frequently visit news sites, social feeds, or video-heavy pages where muted clips load constantly. Switching to “Block Audio and Video” eliminates that visual disruption entirely, so you decide when any media starts.
Managing autoplay permissions for individual websites
If you prefer to allow autoplay on some sites while blocking it everywhere else, Firefox lets you set exceptions. When the browser blocks media on a page, a special icon appears in the address bar. Click that icon to open a panel where you can change the autoplay setting for that specific website, choose “Allow Audio and Video” to permit playback there, or keep it blocked.
You can also manage the full list of site-specific permissions from the same Autoplay settings panel under Privacy & Security. There, you’ll see every site you’ve customized and can edit or remove entries at any time. This approach is useful for sites you trust, like a music player or a video platform, where you want content to start immediately without extra clicks.
For a global block with selective exceptions, set the default to “Block Audio and Video,” then add individual sites to the allowed list. Conversely, if you want autoplay everywhere except a few noisy pages, keep the default at “Allow Audio and Video” and block those specific sites instead. Either way, the address bar icon gives you quick access to adjust permissions on the fly, so you never have to dig through settings mid-browsing.
