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Re:Ebay posts every character a user types into the password... by lmm on Wednesday June 29, 2016 @09:30AM (#12001497)
If they're MITMing they could replace whatever JS you put with something else, by definition.
Re:Ebay posts every character a user types into the password... by ncallaway on Wednesday June 29, 2016 @09:50AM (#12001591)
While this is true, a parent comment from the user you're responding to has already explicitly mentioned this as a potential issue:

"It won't stop a nation state modifying requests in transit and injecting their own js but it will probably stop a nosy sysadmin."