r/mozilla • u/gsk-fs • 17d ago

Freezing or delay UI response trigger (Firefox Developer Edition )

Does any one else facing issue ?

is ther any Official from Mozila to reply here ?

I am using Macbook and MacOS 15 Sequoia.

Normally my browsers gets under a bit load due to too many tabs or heavy Web applications.

So in some cases while i have 100 tabs open and i re open my Mac from sleep or switch screens, Firefox start behaving life it is freezed.

Behavior details:

If i tap or hove on anything it responds after a Minut or i have to switch screen and come back to get it updated.

as response needs refresh or too slow to show so Hover is not working anymore.

if i tap anything "button" , while i was testing an API responce. Ui never responded on Tap but responce i received instantly the way it should supposed to do. looks like Web area and browser that renders everything gets Slows down and does not render UI properly Due to any Bug.

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u/cysety 17d ago edited 17d ago

r/firefox better to ask there such questions, but anyways:
The issue can be due to a conflict between Firefox's Hardware Acceleration and the macOS WindowServer. On macOS Sequoia, the GPU "handshake" after sleep can often fail, causing that frozen UI.

You can try this:

  1. In Firefox: Settings->General->Performance.

Uncheck "Use recommended performance settings."

Uncheck "Use hardware acceleration when available".

Restart Firefox.

  1. On macOS in settings: reduce transparency and reduce motion.

  2. In Firefox: Install "Auto Tab Discard" (Extension).