Comment 3 for bug 1251832

Hi,

This issue seems related to successive migrations of the launcher and
extensions for webapps.

To check that, could you:
- go into your browser extension preferences > installed websites and
remove all of the webapps here (that's
chrome://settings/desktopIntegrationOverlay on Chrome for example)
- stop all browser and webapps
- suppress the launcher icons on your launcher bar if needed
- create a backup folder to keep the potentially broken config files
- move all of the .local/share/applications/<webapps>.desktop files into
that backup folder
- move all of the files in .local/share/unity-webapps/* into that same
folder

This way you should start from a clean state.

Then, re-create the webapps launchers by navigating to Amazon, Youtube,
etc. to re-create them.

Then start the webapps from the Dash or put them on your launcher directly.

David