User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.0.6pre) Gecko/2009010705 Gecko/2008010101 Firefox/3.0.5 Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.2a1pre) Gecko/20090108 Minefield/3.2a1pre Greasemonkey does not work on Minefiled Build 20090106155755. Reproducible: Always Steps to Reproduce: 1.Make sure set "extensions.checkCompatibility" and "extensions.checkUpdateSecurity" to false. 2.Install Greasemonkey0.8.20080609.0 from https://addons.mozilla.org/en-US/firefox/addon/748 3.Restart Firefox 4.Install some user.js from http://userscripts.org/ Actual Results: Greasemonkey does not work and an error message comes out in the Error console. Error: Could not convert JavaScript argument = NS_ERROR_XPC_BAD_CONVERT_JS Source file: file:///C:/Documents%20and%20Settings/fuku/Application%20Data/Mozilla/Firefox/Profiles/qjd59xri.aaa/extensions/%7Be4a8a97b-f2ed-450b-b12d-ee082ba24781%7D/components/greasemonkey.js Line: 108 Expected Results: No error. Greasemonkey works well with 20090106 Trunk. Greasemonkey does not work with 20090107 Trunk Build 20090106155755. I supposed regression of Bug 470720 - Don't automatically unwrap XOWs or SJOWs in XPCNativeWrappers. Bug 471366 - Deal with XPCNativeWrapper.prototype correctly.

No duplicates found. Confirming and marking NEW. Seeing this on OS X too, so OS -> All.

This is mine.

This bug also breaks other extensions, such as Line Marker: https://addons.mozilla.org/en-US/firefox/addon/1931

http://hg.mozilla.org/mozilla-central/rev/122cf69f6692 http://hg.mozilla.org/mozilla-central/rev/427d147720e3 (patch in bug 472792) Greasemonkey works again in today's nightly :)

http://hg.mozilla.org/releases/mozilla-1.9.1/rev/61beb1b0e247 (http://hg.mozilla.org/releases/mozilla-1.9.1/rev/d9ac8c9a8346 and http://hg.mozilla.org/releases/mozilla-1.9.1/rev/130653abfd3f) fixed this on 1.9.1.