Does it still happen in Troubleshoot Mode?

I really don't know if this happens in 'Troubleshoot Mode' Since this 'only occurs every couple of days, I don't see the point in running the browser in a constantly 'degraded' mode. If this should become more regular, I shall activate it and report back!

Does it still happen with hardware acceleration disabled?

Hi, I'm still looking into the H/W acceleration aspect and will let you know ... in addition I found a new folder which seems to contain a lot of Firefox infos, among them this file: store.json.moz.lz4 I have extracted the LZ4 data with : "mozlz4-win64.exe" but cannot attached it here ... and a dump of the contents is too large to add here!