Question

This is my current bookmarklet:

javascript:(function(){ alert(location.href); })();

which seems to work fine, but for me, it doesn’t work on youtube under chrome for some reason.. is there a more robust way to get the location.href? Thanks.

Answer 1

No. You may try

(function(window){window.alert(window.location.href)})(this);

which will make sure you’re not using some custom alert function from the global namespace. But, there is no way prevent window.alert from being overwritten like so window.alert = function () { console.log('Haha!'); };.

The location object should be fail-proof, since the browser’s internal setter method inhibits any shenanigans there (meaning that window‘s location attribute is effectively write-protected, as is window.location‘s href attribute)

Edit:
Looks like bookmarklets don’t work in Firefox 6+ due to “social engineering bookmarklet attacks”, and there’s nothing you can do about it.
https://stackoverflow.com/a/6643466/27862
https://bugzilla.mozilla.org/show_bug.cgi?id=527530