Firefox extension: Memory leak

Created by: mqus

The last few weeks, my firefox (61/62, current stable version) consumed a lot of memory when i left it open for a few hours. After looking at about:memory, it became clear that sourcegraph was keeping memory related to sites that were long closed. Even manually triggering the gc didn't remove those references.

Additional info: I'm using sourcegraph for free and mostly on github for crossreferences. Other firefox extensions i have: httpseverywhere,umatrix,ublock origin.