random high cpu usage with explorer.exe

as the subject states, explorer.exe randomly start eating up 50% of my CPU and l believe firefox is the culprit as closing it down usually resolves the issue. when it happens my system usually crawls for a few seconds then when l check the task manager explorer.exe is usually the service eating up 50% of the CPU.. closing firefox and re-opening generally fixes it however once (yesterday) when it happened closing firefox didnt help, in fact when l did suddenly other services like my antivirus started eating CPU instead however thats only happened once so far. l have downloaded and used process explorer to see what sub-service is eating CPU cycles but it shows nothing just that the service is running at 50% with no sub-service showing high usage which is annoying, however like l said it usually happens when running firefox but its started happening more often over the last day or so which has started getting annoying.

the annoying thing about it is that lve seemingly fixed one issue to experience another.. it only really started when my mkv issue stopped however its started happening a little more since the recent firefox update. my original playback issue (which froze the system for a few seconds once per boot, tho intermittent it would always be the first mkv l opened tho it did happen to specific files) was seemingly resolved by disabling windows media player networking service.. tho not l have this issue lol.. will try redoing my profile.

as requested, ran tool.

on another note, lve also created a new firefox profile.. admittedly in the last l had quite a few redundant addons l used it as an excuse to only use the ones l use regularly this time and the ones l cant do without like lastpass and xmarks.

run as requested, by the looks of it. nothing has been found if lm reading it right.

while l have followed your advice, what will it delete? (l created a restore point none the less but l am curious.