CPU bursts with UI freeze in Firefox

[gabrielfin]

I'm using Firefox 38 with Greasemonkey 3.2 and AdsBypasser 5.25.1.
Apparently adsbypasser is causing CPU bursts, in intervals of between 10 and 60 seconds. Each burst lasts between 1 and 3 seconds, during which Firefox's UI freezes.

It's difficult to reproduce since it doesn't happen immediately, I only notice after browsing for a while. Disabling adsbypasser (and restarting Firefox) definitely stops this from happening.
I tried disabling all extensions and scripts, and enabling them one by one, but the results are inconclusive, since the issue seems to start happening randomly, no matter which extension I re-enable.

Since this is very hard to reproduce and pinpoint where the problem lies, I don't really expect a fix, so I'm just reporting this to see if someone else is having the same issue. Maybe we can figure it out.

[legnaleurc]

I have this issue after upgrading to Firefox 38 on Mac OS X, too.
According to my observation, it happens after hibernation/sleeping while Firefox is still opening.
Restarting Firefox will fix this, until the next hibernation/sleeping.

I'll try a blank profile to see if this still happens.

[gabrielfin]

In my particular case I don't suspend/hibernate while Firefox is open. But it might still be the same issue.

[legnaleurc]

Related issue: greasemonkey/greasemonkey#2200

This issue does not happen on Chrome, so I think it's not cause by AdsBypasser.
Anyway, I'll change to Greasemonkey 2.3 to see if it differs.

[gabrielfin]

I think that's definitely it. I commented the following:

    GM.registerMenuCommand('AdsBypasser - Configure', function () {
      GM.openInTab('https://adsbypasser.github.io/configure.html');
    });

and the problem has not occurred since.

[legnaleurc]

Greasemonkey 2.3 does not has this problem, so I think this is a bug of Greasemonkey 3.2.