STR: 1. Create a new Firefox profile 2. Install Adblock Plus addon. I am using Adblock Plus version 2.0.3 on Mac OS X 10.6.8. 3. Open menu: Tools > Adblock Plus > Filter preferences 4. In Filter preferences' Actions dropdown, choose "Update filters" 5. That filter's "Last download:" should say "Downloading..." and then "(Success)" 6. Choose "Update filters" a SECOND TIME, for the same filter or any other filter! AR: That filter's "Last download:" will say "(Failed, Not a valid address)"! ER: "(Success)" I believe this is a regression starting in Nightly build 2012-03-31. Here are my bisection test results: * Nightly 2012-03-29 = "(Success)" then "(Success)" * Nightly 2012-03-30 = "(Success)" then "(Success)" * Nightly 2012-03-31 = "(Success)" then "(Failed, Not a valid address)" * Nightly 2012-04-02 = "(Success)" then "(Failed, Not a valid address)" * Nightly 2012-04-05 = "(Success)" then "(Failed, Not a valid address)" * Nightly 2012-04-10 = "(Success)" then "(Failed, Not a valid address)" * Nightly 2012-04-11 = "(Success)" then "(Failed, Not a valid address)" * Nightly 2012-04-12 = "(Success)" then "(Failed, Not a valid address)" * Nightly 2012-04-15 = "(Success)" then "(Failed, Not a valid address)" * Nightly 2012-04-20 = "(Success)" then "(Failed, Not a valid address)"

Chris, what are the mercurial changeset IDs for the last good and first bad build?

Sorry, I don't have a desktop Firefox build environment to build and test individual changesets. I just downloaded Nightly builds from ftp.mozilla.org.

You can get the Mercurial build ids by typing about:buildconfig in the address bar or application.ini from an unpacked version.

20120330031146: http://hg.mozilla.org/mozilla-central/rev/92fe907ddac8 20120331031108: http://hg.mozilla.org/mozilla-central/rev/4c43cfe73516 http://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=92fe907ddac8&tochange=4c43cfe73516

> You can get the Mercurial build ids by typing about:buildconfig in the address bar Yep, that's all I was asking for: the urls from about:buildconfig from the two nightlies bracketing the behavior change.