One of the more useful Extensions I use, is the Slack integration. It allows me to select a selection of code or even an entire file, and send it right into my Slack instance. It can send as a DM to someone, or into the channel you specify.
It's a great workflow for sharing code with team members - useful snippets, or something you're having a problem with.
Then AdvancedNewFile is great for quickly creating a new file. CMD-Alt-N will drop down the palette where I can specify the starting folder, and then just type out the path to the new file I want to create and it'll build/out/the/path-to-the/file.html. Quite useful :)
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