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This is the official development build of uMatrix.
The stable version of uMatrix is at:
Use this development build of uMatrix if you want to help test new fixes since last stable release version, and to help find regression bugs.
Report regression bugs at uMatrix issue tracker:
"uMatrix dev build" does not share any settings with the stable release of "uMatrix", they are installed as two distinct extensions. If needed, use the backup/restore feature of uMatrix to transfer settings between the two extensions.