This is a WebExtension that adds an "Edit Tags" button to all node, way,
and relation pages on the osm.org website.
The button opens a text area for editing raw tags (in form key=value) with
a "Save" button to upload changes.
Either open the development console and use the source code, or head over to your browser's extension store:
Written by Ilya Zverev, published under MIT license.