You could try GhostText with the atomic-chrome package. See below:
I do not have any personal experience using this setup. System-wide Emacs key theme is good enough for me.
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From: Platform Independent Linux List! <[log in to unmask]> On Behalf Of Brian Bartholomew
Sent: Wednesday, June 5, 2019 6:25 PM
To: [log in to unmask]
Subject: Editing Firefox text boxes with emacs?
Does the list have any advice about Firefox browser plugins for editing web form text boxes with emacs? Perhaps sent to an emacs in server mode? This is on Ubuntu 18.
Working Version Brian Bartholomew, President
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