Extension slowing down sites

[Christophe999s]

Extension causes sites to take 100% CPU. Using MacBook Air M1, tested with both Waterfox and Brave. Disabling the extension solves the problem. With extension enabled, the page does not continue

With the extension disabled, page loads immediately

[claabs]

I'm also seeing this on several sites on Firefox 122. Here's a random public site that experiences it.

I ran the profiler, and here's the stack trace of some code that gets 60% of the hits:

o [Extension "2FAS - Two Factor Authentication" (ID: admin@2fas.com): moz-extension://a7ae6c4b-9c0a-4c6e-9535-1cf4b9aa1e69/content/content_script.js:1:24708]
./src/content/observer/observerFunctions/checkChildNodes.js/o/< [Extension "2FAS - Two Factor Authentication" (ID: admin@2fas.com): moz-extension://a7ae6c4b-9c0a-4c6e-9535-1cf4b9aa1e69/content/content_script.js:1:24765]
map [self-hosted:221:18]
o [Extension "2FAS - Two Factor Authentication" (ID: admin@2fas.com): moz-extension://a7ae6c4b-9c0a-4c6e-9535-1cf4b9aa1e69/content/content_script.js:1:24708]
./src/content/observer/observerFunctions/checkChildNodes.js/o/< [Extension "2FAS - Two Factor Authentication" (ID: admin@2fas.com): moz-extension://a7ae6c4b-9c0a-4c6e-9535-1cf4b9aa1e69/content/content_script.js:1:24765]
map [self-hosted:221:18]
o [Extension "2FAS - Two Factor Authentication" (ID: admin@2fas.com): moz-extension://a7ae6c4b-9c0a-4c6e-9535-1cf4b9aa1e69/content/content_script.js:1:24708]
./src/content/observer/observerFunctions/addedNodes.js/e.exports/< [Extension "2FAS - Two Factor Authentication" (ID: admin@2fas.com): moz-extension://a7ae6c4b-9c0a-4c6e-9535-1cf4b9aa1e69/content/content_script.js:1:24251]
map [self-hosted:221:18]
./src/content/observer/observerFunctions/addedNodes.js/e.exports [Extension "2FAS - Two Factor Authentication" (ID: admin@2fas.com): moz-extension://a7ae6c4b-9c0a-4c6e-9535-1cf4b9aa1e69/content/content_script.js:1:24188]
./src/content/observer/createObserver.js/e.exports/</< [Extension "2FAS - Two Factor Authentication" (ID: admin@2fas.com): moz-extension://a7ae6c4b-9c0a-4c6e-9535-1cf4b9aa1e69/content/content_script.js:1:22528]
forEach [self-hosted:203:22]
./src/content/observer/createObserver.js/e.exports/< [Extension "2FAS - Two Factor Authentication" (ID: admin@2fas.com): moz-extension://a7ae6c4b-9c0a-4c6e-9535-1cf4b9aa1e69/content/content_script.js:1:22498]
MutationCallback

For now, I'm just disabling the extension.

[cshafer2]

I'm seeing a similar slow down with dramatically increased loading times for my locally hosted Omada SDN controller. Loading times go back to normal after disabling the extension.

[ScottESanDiego]

I see that, and also some sites fail to load completely. E.g., the eBay "sell an item" page where you make a new listing. With 2FAS extension enabled it fails to completely load (Chrome shows the "X" icon not the "Reload" icon, and you can't change things like dropdown menu items on the page). Unclear if this is a side-effect of the CPU usage, or not.

[GrzegorzZajac000]

Sorry for the inconvenience. I'm already working on a fix

[GrzegorzZajac000]

I have just submitted version 1.6.1 for testing. If everything goes smoothly, the new version will be sent to extension stores within a few hours.

[Kiyo5hi]

I faced the same issue these few days. It takes forever to load Jupyter Lab. After disabling the extension, the page is loaded without issue.

[aaron3238]

I am also experiencing the above issues. Thought it was me. Thanks for taking a look at it quickly.

[GrzegorzZajac000]

v1.6.1 has been uploaded to stores. It should be visible in the next few hours.

[Christophe999s]

Thank you, just got the update and everything seems ok now!

[MagsMagnoli]

@GrzegorzZajac000 I'm on 1.6.1 (Firefox) and sadly still see the issue. Oddly it doesn't happen when I directly visit the page in question but when navigating to it via anchor tag.

Check it out:

• visit: https://nadcl.mags.gg/events/vqb7btlrptckj7kayslubpy9
• click 'players' and the site hangs
• open a new tab and visit the players page directly and its fast: https://nadcl.mags.gg/events/vqb7btlrptckj7kayslubpy9/players

[ScottESanDiego]

Good find @MagsMagnoli . I see the same behaviour on Chrome/Windows.

[aaron3238]

@GrzegorzZajac000 I'm on 1.6.1 (Firefox) and sadly still see the issue. Oddly it doesn't happen when I directly visit the page in question but when navigating to it via anchor tag.

Check it out:

• visit: https://nadcl.mags.gg/events/vqb7btlrptckj7kayslubpy9
• click 'players' and the site hangs
• open a new tab and visit the players page directly and its fast: https://nadcl.mags.gg/events/vqb7btlrptckj7kayslubpy9/players

Can replicate same behavior on vivaldi/linux. Loads fine via anchor tag with extension disabled. Tried testing this with other sites that load large amounts of data in one go and I've had inconsistent results. Will try some others.

[GrzegorzZajac000]

@MagsMagnoli @ScottESanDiego @aaron3238 Thanks for testing. I'll check it

[GrzegorzZajac000]

Sorry for the bugs in v1.6.1. I have just released version 1.6.2 to QA, which should fix all of the above issues.

[GrzegorzZajac000]

Sorry for slight delay, but we had few another problems. v1.6.2 was uploaded to stores. Should be available in near future for users. Thank you for patience ;)