High CPU usage when have the protected tabs on Firefox

[Tykveg]

Firefox 119.0 (64-bit) from snap, ubuntu Website Notes 3.7.12 from Firefox add-ons store After the update, if I have any tabs that are protected by Firefox (e.g. about:addons), for some reason the extension consumes a lot of cpu power (100% usage basically) (got it from about:processes and system monitor). If I close those tabs, everything is back to normal. Of course, if the extension is disabled, everything is fine (even if I have those protected tabs), so I'm certain that this extension causes it (I can't see what extension does 100% cpu usage in about:processes).

[Sav22999]

@Tykveg So you have this problem only on "about:addons" tab?

Have you tried on "about:debug", "about:blank", etc.?

Can you try also on "addons.mozilla.org".

Thanks!

[Tykveg]

Okay. 100% cpu usage on "about:debug" too, but on "addons.mozilla.org" and "about:blank" everything is fine.

[Sav22999]

@Tykveg Ok, this is very weird. I thought there was some cpu usage for "unsupported" webpages, but it isn't.

I'll investigate right now, thank you very much and sorry for the inconvenience!

[Tykveg]

Also everything is fine when I open special extension pages, that starts with "moz-extension://"

[Sav22999]

@Tykveg Ok, I think I've found the issue. I'll release an update in (max) an half and hour. Please, then let me know if there is yet this abnormal usage of CPU.

[Tykveg]

Okay. Thank you!

[Tykveg]

I tested beta branch. I don't see 100% cpu usage anymore with those tabs.

[Sav22999]

@Tykveg Perfect! Thank you. I'm releasing also on Firefox Addons, so in some minutes it should arrive officially via AMO 😄