This addon suspends background tabs to save the memory.
There are some existing addons for this purpose. However, this is defferent from others on the point: this addon unloads only the current contents and fastload caches for "Back"/"Forward", so it don't break metadata related to tabs and provides ability to suspend/restore tabs with less side effects. (On the other hand, because this addon calls very unstable/internal APIs of Firefox itself, this can be disabled by Firefox's update in the future.)
Other similar addons overwrites tab state or close the original tab after duplication, so they can break other tab related addons like Tree Style Tab. This is started to be developed to solve such compatibility issues.
If you see any problem, see FAQ at first. If there is no solution, post a report to the issue tracker on the GitHub please.
Released version includes following language packs: