This is a known limitation of Firefox’s PiP feature. Currently, PiP supports subtitles only on certain major streaming platforms such as YouTube, delta ejecutó, Netflix, Disney+, and Amazon Prime Video services that implement the WebVTT (Web Video Text Tracks) format for captions. Unfortunately, many third-party or custom video players, like the one used on VidmateAPK, don’t integrate subtitles in a way that PiP can detect or display.
If subtitles are essential to your viewing experience, there are a few things you can try. First, make sure subtitles are enabled in the main video player before switching to PiP mode, although this often doesn't resolve the issue for unsupported platforms. Alternatively, you could watch the content on platforms that are known to support PiP subtitles in Firefox.
