Steps to reproduce: 1. Open the Error Console 2. Evaluate [""]..length Expected result: Error: XML descendants internal method called on incompatible Array Source file: javascript: [""]..length Actual result: Source file: javascript: %5B%22%22%5D..length Suggested solution: Instead of encodeURIComponent, using .replace(/%/g, "%25") should be sufficient (that's what Console² does). From bug 342662 comment #12: If you want to be sure about non-ASCII Unicode characters, what about .replace(/[^\x20-\x24\x26-\x7F]+/g, encodeURI) as a compromise? This encodes everything except printable 7-bit-ASCII characters (% being the exception to the exception). OTOH I haven't seen any bug report to that end so far and we haven't encoded any (Unicode) characters since day 0, so we might just as well escape only that one character (which shouldn't make much of a difference) and wait for further bug reports such as this one [i.e. bug 342662] about other characters.

Comment on attachment 264504 [details] [diff] [review] fix Evaluator.location ;-)

mozilla/toolkit/components/console/content/console.js 1.9 mozilla/xpfe/components/console/resources/content/console.js 1.28