It works pretty well with my Firefox Quantum 69.0.3 (64-bit) even with Google Docs, and generally I'm satisfied. However, there's one huge issue - I cannot reset / remove any data this extension stores. I have imported a quite large JSON library, and now I need to replace it with another one. Import/Export button does not help with removing old data. Removing Firefox cookies & site data does not help either. Removing and reinstalling the extension does not work. Seems like the only way to do this is to manually hit 'trash' button near each of the 700 entries in the library which is not efficient. I cannot use this extension due to this issue any more. For other people to prevent this I would recommend saving empty or almost empty data set as a local backup and use this backup to reset extension. My backup file is huge as well so it won't work for me at this point.