shaka-player: Firefox unable to seek in video

We use Shaka player at our streams and it works great at chrome. But at firefox it either don’t event start or stops when user moves the seek bar. I will send link to application via email.

Have you read the FAQ and checked for duplicate open issues? YES

What version of Shaka Player are you using? 2.5.9

Can you reproduce the issue with our latest release version? YES

Can you reproduce the issue with the latest code from master? YES

Are you using the demo app or your own custom app? Custom app

If custom app, can you reproduce the issue using our demo app? NO

What browser and OS are you using? Firefox, macOS/win

What are the manifest and license server URIs? Will send it via email

What did you do? Play the video in sent link. If it plays, I move the seek bar

What did you expect to happen? Video should start, when user moves the seek bar, it jumps to given playtime and play the video

What actually happened? Video didn’t start / stopped when seek