ClearURLs vesion 1.27.1 causes huge memory leaks on Firefox 134.0.1

[ArcticGems]

I upgraded to Firefox 134.0.1 today (from Firefox 134.0) and now Firefox has a crazy high memory usage.

After manually disabling every addon one by one in Firefox, the huge memory issue disappeared when disabling ClearURLs.

Sometimes I could see a url constantly refreshing/updating. For example I saw a letter in a repo name constantly switching between lower case and upper case.

Easiest way for me to get this huge memory usage is on Github.

[Leah96xxx]

I can confirm that I'm seeing similar issues with this in Floorp 11.22.0 (based on Firefox ESR 128).

So far I've only seen the memory leak happen in DuckDuckGo tabs while Bitdefender Trafficlight is also enabled, so it seems to be at least conflicting with that and causing both a memory leak and high CPU usage. Trafficlight hasn't been updated since August, while ClearURLs was only just updated recently, leading me to suspect that the issue lies in ClearURLs 1.27.1. I'd guess other extensions may also be conflicting.

I did notice that on DuckDuckGo it was repeatedly replacing the + symbols in the URL's query string with a space, which is of course invalid since URLs can't have spaces. For example ?q=one+two+three was being replaced by ?q=one two three . This behaviour existed even without other extensions enabled, even if couldn't trigger the memory leak without them.

For now I've manually downgraded ClearURLs back to 1.23.1 and am no longer able to recreate either the memory leak issue or the adding spaces issue, even with other extensions enabled.

[raxod502]

Yeah, this just started happening recently (in the last few days) for me in Firefox. On multiple different websites (I suspect ones where JavaScript is used to edit the page URL), such as Nextcloud and YouTube, after navigating between a couple of different pages using the in-page links, I start seeing the URL bar oscillate rapidly between multiple different history entries, Firefox pegs my CPU, and page rendering / navigation slows down. Closing the affected tab/window reclaims resources.

With ClearURLs extension disabled, the problem immediately goes away.