621174 - String.prototype seems broken in FF 4.0 B8

Status: RESOLVED DUPLICATE of bug 610973

(Core :: JavaScript Engine, defect)

Description

[Edward Rudd]

User-Agent:       Mozilla/5.0 (Macintosh; Intel Mac OS X 10.6; rv:2.0b8) Gecko/20100101 Firefox/4.0b8
Build Identifier: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.6; rv:2.0b8) Gecko/20100101 Firefox/4.0b8

I have a web application where I modify the prototype of String to include a "sprintf" style method..  such that  'Count %d'.sprintf(cuontVariable) will result in 'Count 234'.    

With FF 4 b7 I noticed one page in the application didn't like using the .sprintf call but the rest of the application was fine..  (they were globally in an included script file and thus executed directly on load).

Now with B8 the entire application no longer works as ALL instances of .sprintf do not work. It is as though the prototype changes had not occurred.

I am working on trying to build up a smaller test case to recreate the issue and will update the bug.   But this makes FF 4 B8 completely useless with the web application I'm developing for my company.

Reproducible: Always

Steps to Reproduce:
Will provide test case in the next day or two with steps to recreate.

Comment 1

[Jan de Mooij [:jandem]]

Could this be bug 610973?

Comment 2

[Boris Zbarsky [:bzbarsky]]

Hard to say without a testcase!

Comment 3

[Edward Rudd]

I believe it is the same.. Closing as duplicate..   Once I disabled firebug, everything worked flawlessly.  :(  I'll make sure the Firebug developers know of this issue.