Add ability to filter at the tracking snippet level
While the new ability to filter certain error strings from the web UI is really nice, it appears that silenced errors still count against your quota. For lower quotas, one person with an aggressive (and incorrect) browser plugin can empty your daily quote in minutes!
I noticed in the implementation of the tracking snippet that you're filtering out certain strings explicitly, such as:
Error loading script (in Firefox)
...would it be possible to augment the _errs.meta hash so that it could take in an optional list of strings to filter on? In this way, users could build their own list of "excluded" strings that the tracking snippet would always ignore. This would keep tracking snippet file sizes down and I imagine would also cut down on the number of requests coming in to your servers.