I'm similar, which sounds like the same behaviour. If I have Firefox closed, and then open a "tab added to taskbar", that opens as expected. However, a link to another website opens full Firefox, as expected. However, Firefox has now lost any pinned ...
What makes it even more of a PITA is that virtually all Firefox mobile users will also be desktop users and will be used to [and created] their order on the desktop. Synchronizing between the two should be exactly that, mobile should not impose a dif...