Error: Cannot open the page from the filesystem.

Chrome: Install SingleFileZ and enable the option "Allow access to file URLs" in the details page of the extension (chrome://extensions/?id=offkdfbbigofcgdokjemgjpdockaafjg).
Microsoft Edge: Install SingleFileZ and enable the option "Allow access to file URLs" in the details page of the extension (edge://extensions/?id=gofneaifncimeglaecpnanbnmnpfjekk).
Safari: Select "Security > Disable Local File Restrictions" in the "Develop > Developer settings" menu.