Edit: I found out that the add-on warns about high CPU usage for some of its presets (Preferences->General->Presets). Using a different preset has removed that ~10% CPU usage.
Some preliminary context: Since one or two updates ago, I've noticed that Firefox is using around 10% CPU even then all tabs are unloaded. This didn't happen before. The add-ons I use are still the same, and I have blocked the new LLM functionality. (Maybe someone else noticed the same?) Anyway, in order to investigate, I'm switching off the add-ons one by one, as usually done, checking if the situation improves.
While doing so I was wondering whether I still need Canvas Blocker. I see its most recent reviews are 4 years old now. Does anyone know whether it's still needed for privacy, or if Firefox now provides some of the same functionality built-in? I do use AdBlock Origin as well.
Thank you for info and opinions!
Closes Firefox. Opens with no tabs. looks at
top -d20for a few iterations. Repeats with Canvas Blocker disabled and Firefox restarted. Looks at the about:performance tab in Firefox, looking at Extensions CPU usage each way.On my system, it's mostly in the neighborhood of 0.4% CPU usage while idling with no tabs either way. I don't see any overwhelming difference. CPU might be a hair higher with that addon enabled, but I'm not willing to spend a lot of time taking a ton of samples looking for for very small differences. You could measure it on your system for an extended period of time if you wanted, though, hammer down exactly whether there's any impact.
Thank you for checking this out! I found out that its preferences, under "presets", warn about high CPU usage depending on the presets. Now I chose a different one, and that 10% CPU is gone.