Problems with recent Firefox updates

[nmm-barg-org-uk]

Version: recent releases, including 131.0
System: MacBook Air, macOS Monterey 12.3

Firefox has degraded over the last few releases.  (Sorry, I know that's vague but initially I thought it was just a temporary glitch and didn't note details.)

* Activity Monitor shows Firefox and Firefox CP Web Extensions each running at very high CPU percentages

* Often have to click twice to select an item.  It's as though the first click is lost.

* Pages are very slow to paint initially.  A good page to see this on is
     https://www.carolinescooking.com/malabar-prawn-curry-shrimp/
  As you scroll down the page you often have to wait about a second for the blank space on the screen to be drawn.  Often this is for an image, but the images are all less than 250kB so it's not due to huge download.  And in any case ...

* When you at last get to the bottom of a page and then scroll backward to the top, it's still slow to draw the page content - with one-second delays -- even though all the text and images have already been downloaded.

We don't have the same problems with Chrome on the same pages.

[ThePillenwerfer]

That page opens fine for me on Firefox 131 under Debian on a fifteen-plus year old computer.  It could be a problem with the Mac builds.

[miro18]

I have the same problem with Fedora installation (Firefox installed via DNF).

Even when there's no activity, with already rendered static page with no inputs from user, the CPU still gets crazy.

I have experienced this for past 2 weeks. My current version is 131.0.3, 64bit.

[Piercejeans]

My problem is now with streaming. What were smooth running online sites are now buffering, shutting down, and refusing to operate at all.

[scott122]

Firefox on my iMac Sequoia 15.2 used to work fine with Firefox until the recent update to 134.0.1.  Now this website doesn't work correctly.

Firefox 134.0.1 has "broken" https://www.arkansasonline.com/entertainment/puzzles/king2/

The puzzle loads, and I can do it, but I am unable to check the puzzle as I go through it.  Everything worked fine until the most recent update.  And the website works correctly with Sarari.

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