Steps to reproduce:

1. Open an anime episode that has subtitles available (tested with kisskh extension)
2. Enable Autoplay or use the Next Episode button
3. Let the player advance to the next episode automatically
4. Observe that subtitles do not appear in the player despite being listed in the subtitle menu

Expected behavior:

Subtitles should load and render correctly when advancing to the next episode via
Next/Autoplay, and MPV config/subtitle settings should be re-applied automatically.

Actual behavior:

Subtitles are fetched (visible in the subtitle selection menu) but do not render in
the player. MPV config and subtitle settings also appear to not be re-applied for the
new episode. Closing the player and manually reopening the episode resolves the issue.

Other details:

• Workaround: close the player and reopen the episode manually to get subtitles working
• Possibly affects other extensions beyond kisskh, needs reproduction with a different source
• MPV config / subtitle preferences (font, size, language) may also be silently reset on episode transition