Firefox desktop · Research guidance. Instructions are based on publisher guidance; a UK IPTV account was not tested on this platform.
Try deliberate playback first
Open the intended page and press its play control yourself. If it plays after that action, the issue may concern automatic starting rather than a completely unplayable video. Note whether the problem is silence, a blocked start or a later interruption. Those details prevent an autoplay test from being mistaken for a fix to every playback symptom.
Inspect the active-site indicator
Mozilla documents an address-bar indicator when Firefox blocks autoplay on a page. Open that permission panel to inspect the current website’s choice. The site exception can differ from the default used elsewhere. Check the domain shown before changing it, especially when a login page or embedded content uses a separate origin.
Choose the actual behaviour required
Firefox distinguishes blocking audible autoplay, blocking both audio and video, and allowing both. The all-media blocking option can stop a muted video as well, so silence is not the only possible sign. Use the website-specific choice that fits the task instead of opening a global exception for every page you visit.
Save and test one case
Mozilla’s settings interface lets you review and save the site-exception list. After changing a relevant choice, return to the same sample and repeat the same action. If the media still fails after a deliberate play, retain that observation; a permission can allow an attempted start without guaranteeing content availability or successful playback.
Leave a sensible lasting preference
When the experiment is finished, restore the site to the default or retain an explicit exception only if you want it. Avoid making several privacy and extension changes at once. A support note should identify the tested autoplay state without exposing account credentials or implying that Firefox has verified the service.
Questions, answered
Can Firefox block muted autoplay too?
Its block-audio-and-video option blocks autoplay even when media is muted.
Must the global default change for one site?
No. Mozilla documents site-specific autoplay exceptions.