Bewertet mit 4 von 5 Sternen
This add-on could not be installed because it appears to be corrupt.
I have Firefox 52.5 ESR.
looking in version history page, Version 3.4 works with Firefox 48.0 and above.
looking in "mvm" page, version 3.4 works only with firefox 57+.
I think that the problem is only a wrong information.