@Onur-Baran Should be 🔜 not much left on 1.15.0 milestone. https://github.com/NodeBB/NodeBB/issues?q=is%3Aopen+is%3Aissue+milestone%3A1.15.0
Plugin Hook for editor
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There's actually a client-side method in the composer that lets plugins add buttons, I have a plugin that uses it as an example:
https://github.com/psychobunny/nodebb-plugin-spoilers/blob/master/static/spoilers.js#L3