The article you linked makes a big deal about literally nothing. We’ve known Chrome was going to drop MV2 for years. We also know Firefox won’t. There is nothing more they have to do or say about this situation. It doesn’t affect Firefox whatsoever.
“Suspiciously silent” is such a bullshit nothing accusation to make. It is so obviously trying to capitalize on how many users have been (justifiably) turning on Mozilla as of late.
try disabling any krunner plugins you don’t need. that should make things faster.