The extension uses a new URL fragment addition that Chrome has shipped: https://github.com/WICG/scroll-to-text-fragment so these links will work on any Chrome/Chromium-based browser. (in non-Chromium browsers without the extension the link will load but the fragment wont be recognized)
The hope is that this is useful and adopted by other browser engines and links like this would eventually be interoperable.
The hope is that this is useful and adopted by other browser engines and links like this would eventually be interoperable.