Very nice extension, but after the last update it just is not working. In languages only English and German are selected, in settings non of the checkboxes are checked and when I do check them and close the settings - they are not saved. Probably something has broken in my Firefox after latest update to 57.0.1, but other extensions work well, the problem is with this one. Will continue to investigate.. The rate is still 5* !
Hi Dmitry, it's a known Firefox issue that it deletes all the storage of extension in certain cases: http://forums.mozillazine.org/viewtopic.php?f=9&t=3034189
We're working on a solution that could bypass this.
