Mozremotebuilder is a project mainly written in Python, it's free.
firefox regression finder for commits that builds moz-central changesets on a remote server
Regression finder that bisects on changesets, then builds changesets from moz-central using a remote server, downloads, and runs the built binaries interactively.
mozremotebuilder sends requests to mozbuildserver, then waits on messages from mozilla pulse. mozbuildserver makes a commit to the mozilla tryserver for building.
mozremotebisect -g [last good date] -b [bad date (default today)]You can also use changesets instead of dates by setting -c flag to 1
mozremotebisect -g [last good changeset] -b [bad changeset] -c 1