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Re:Pterosaur: Full power of Vim in each Firefox text field by skymt on Sunday March 22, 2015 @02:21PM (#9247705)
An extension called It's All Text! provides the same feature without Pentadactyl's total UI overhaul.

https://addons.mozilla.org/en-US/firefox/addon/its-all-text/

Re:Pterosaur: Full power of Vim in each Firefox text field by edwintorok on Sunday March 22, 2015 @02:33PM (#9247739)
"It's All Text!" plugin is great for editing wiki pages, or anything with a large amount of text in it.