On pages that are "unvisable" on a PC or laptop. Thanks!
(I only wish it would work on Android cellphones as well, where there is no right-click...)

There is a problem with this addon. It writes "https://unvis.it/http://*.*/" in front of the url (*.*) instead of "https://unv.is/*.*/". This cause a security issue in Firefox that cannot be passed or added as an exception. (error code: SEC_ERROR_EXPIRED_CERTIFICATE).
Too bad - because it would be very practical to open links by just a rightclick.