913915 - Running a long script blocks the browser

Status: RESOLVED DUPLICATE of bug 682447

(DevTools :: Console, defect)

Description

[Sankha Narayan Guria [:sankha]]

When I open the Web Console and execute a long running script like:

var x = 0;
var now = Date.now;
for (i = 0; i < 100000000; i++) {
	x = x + 1;
}
console.log(Date.now() - now);

The browser becomes non responsive for a few seconds, and then I get the message to kill the script because the script is not responding.

Expected results: The rest of the browser should respond to the user commands like switching tabs, etc.

For comparison purposes, the similar thing can be tried on Google Chrome too, and the browser responds while it is still executing the script.

Comment 1

[Sankha Narayan Guria [:sankha]]

Err, the line 2 will be:
var now = Date.now();

Comment 2

[Rob Campbell [:rc] (:robcee)]

We have a bug on file for this already. Marking as duplicate.