Question

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JavaScript alert not working in Firefox 6

I often execute Javascript code in the address bar (mostly for debugging and testing):
javascript:alert(some_function_with_interesting_return_value(‘blah’));
Or – more obvious:
javascript:alert(‘interesting value’);

This doesn’t seem to work anymore with Firefox 6:
Error: uncaught exception: ReferenceError: alert is not defined

How is it possible for alert() not to be defined ?

I’ve double-checked it with Firefox 5, Epiphany, Midori and Chromium – works fine.

Answer 1

I think it’s maybe prevention, because a lot of sites abused this.

FYI, I’m probably going to split this bug into multiple, short and longer term fixes.

Short term: disallow pasting of javascript: URLs into the URL bar
Longer term: additionally require that bookmarklets be "whitelisted" in the Bookmark Manager before it can run JavaScript

https://bugzilla.mozilla.org/show_bug.cgi?id=527530#c6