That second 'instance' (it actually keeps only one instance running) might not be helping in bringing up your windows. Try clearing your (startup/local) cache, it might have become really big. I do that whenever my Firefox takes long times to start - if you check in Process Monitor, at that time it is dealing with those cache folders.
I dunno, I just noticed it "pops" up as soon as I try to start it again. Note that this is the first start I'm talking about. I'll try that cache cleaning.
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That second 'instance' (it actually keeps only one instance running) might not be helping in bringing up your windows. Try clearing your (startup/local) cache, it might have become really big. I do that whenever my Firefox takes long times to start - if you check in Process Monitor, at that time it is dealing with those cache folders.
I dunno, I just noticed it "pops" up as soon as I try to start it again. Note that this is the first start I'm talking about. I'll try that cache cleaning.