Does that meet your needs or do you prefer to edit and run scripts from a dedicated window?
The Web Console appears to lack a way to save your script. On the DevTools forum, there was a suggestion to adopt a feature from Chromium-based browsers which let you save scripts that you could run in the editor. https://discourse.mozilla.org/t/why-dont-you-provide-functionality-for-saving-code-snippets-in-firef... That doesn't seem to have progressed, but perhaps would be a quicker fix than a dedicated window?Just a thought.