Have successfully transitioned to the new version with the external Python helper application (on ubuntu, a version of python was already previously installed). For the previous version, I had "browsers" (actually custom scripts) specified by command line, and the UI for the new version made it relatively painless to re-create them. The biggest frustration was that browsers configured under the old version aren't automatically imported into the new version upon upgrade - and in my first attempt to set a browser up, I got my entry for the "name" and the "command" field the wrong way round - but after correcting that mistake, it worked first time.