Disable all of them except the MS and Opus ones.
If the problem stays away, enable half the ones you disabled to see if the problematic extension is in that half or the other half, then repeat until you've narrowed it down to a particular extension.
(Assuming it isn't a really nasty problem, like one which only happens when two things are enabled together. That's pretty rare, though.)
Just in case, after enabling/disabling a batch of extensions, fully exit Opus and restart it, to make sure nothing was left lingering in the process. (Some extensions create their own background threads the first time they are used, for example.)