Firefox 57 with Sandboxie in Windows 10 doesn't use pinned taskbar icon

[APMichael]

That's strange! Did you try starting Firefox by just entering "firefox.exe" in the search field? Is that icon also missing the "pin to taskbar" option?

[cornflake]

That's strange! Did you try starting Firefox by just entering "firefox.exe" in the search field? Is that icon also missing the "pin to taskbar" option?

Yes strange. It does appear on the icon and I can pin to taskbar from the icon but the problem is the same.

[APMichael]

Sorry, no idea left.