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[Funny Suggestion] Mozilla should make a moz protocol
(discuss.tchncs.de)
A place to discuss the news and latest developments on the open-source browser Firefox
"Did not know" is correct. "Knew" generally comes after a pronoun "I knew, he knew, they knew. " Know, however, is also fine after pronouns.
I'm sure there's a properly defined rule in English for it, but I definitely don't know it.