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Esc only workaround Rated 5 out of 5 stars
Indispensable addon for everyone who considers themselves power users.
No need to install third party key definition addons to make this work only with Esc, and noShift.
Unzip the extension and edit the js file inside. Around line 22 there is the definition of the shortcut. Just comment the line 22 (I think this was the line) and repackage the zip then rename to xpi and install manually. Works.