Bramble is only fully supported by the Google Chrome browser.
Google Chrome ("the chrome browser") is the open source browser called "Chromium".
When Microsoft released their browser "Edge", they based it on Chromium to save them the big task of starting from scratch.
Whilst the new Edge is indeed based on Chromium, and therefore a big improvement relative to the legacy version, there is still some key functionality required by Bramble which it doesn't support. These include synopsis, search, subject detection etc.