Been trying out uMatrix for the past day or two, and I'm liking it a lot.
Unfortunately the "Very bare walkthrough for first time users" has never been finished...and from what the Pale Moon folks are saying, the filtering works fine without Australis but the icon does not. So Seamonkey is probably out of luck.
However, the functionality seems like a good mix of RP, ABP, and ABE. Choose the origin scope (domain, subdomain, or global), then you have a matrix of destinations (at different granularities) and request types that appear on the current page. You can whitelist or blacklist any combination by clicking the top or bottom of each row, column, or cell. You can also disable all filtering on the current origin scope, spoof user agent or referrer, force HTTPS...pretty sweet.
Truthfully, it does cast a lot of doubt on the value proposition of SABER...ABE can still do things that uMatrix can't, but you probably want to write that kind of specialised stuff directly in text anyway. For the kind of day-to-day usage where you really want a GUI, I think uMatrix may have it covered, better than I could do without a whole lot more time than I think I'll have to invest in it.
Thoughts? [edit by barbaz: that discussion was moved to the main SABER thread viewtopic.php?f=19&t=8059 ]