"Disable reading from HTML5 canvas" breaks extension icons

[SuperValue]

When "Disable reading from HTML5 canvas" is turned on, extension icons are frozen and can't be changed.

The best example I have is LastPass. Normally, the LastPass icon changes from Gray to Red after you log into it (change icons I believe). When the "Disable reading..." feature is turned on, the icon never changes no matter what. Whatever icon you see in the browser before you turn on "Disable reading.." is the one you are stuck with. I suspect there is some JS code they are using to change icons after you login and this breaks that. I also see it affecting uMatrix as well.

[oftentired]

Acknowledged in a previous bug report link here
I'll move this Topic to Known Issues forum as it was acknowledged in September.

I will take a look into this problem. There should be a way to enable the canvas reading for extensions only.

Thanks to @dev here, I've isolated the new html5 canvassing security option as the cause of toolbar icons not being able to change their color as they should. This setting locks the icons into whatever state they are in when it is set. Affected are icons to such extensions as Lastpass, ublock, gmail notifier, etc. This has been in effect over the last several SJ versions.

[flashpeak]

Actually this problem is supposed to have been fixed a while back. Are you using the latest version?

[josegimcam]

Persists in 7.0.8.0

[DiadoNiki]

It persist in 8.0.1.0 also. The icon of uMatrix is frozen and show no counter of blocked page elements, but the icon of internal Ad-block work.

[josegimcam]

Confirmed for 8.0.1.0

[josegimcam]

It´s also affecting WOT icon in 8.0.1.0

[neillawrencekkd]

When "Disable reading from HTML5 canvas" is turned on, extension icons are frozen and can't be changed.

The best example I have is LastPass. Normally, the LastPass icon changes from Gray to Red after you log into it (change icons I believe). When the "Disable reading..." feature is turned on, the icon never changes no matter what. Whatever icon you see in the browser before you turn on "Disable reading.." is the one you are stuck with. I suspect there is some JS code they are using to change icons after you login and this breaks that. You need to allow access to the Canvas API to only verified sources and that’s it. But in my opinion there is no such function in opera. I am fascinated by such problems, for some reason I like solving them. I recently started studying how to create an online learning management system scratch, read how you can develop an LMS from scratch, and so far nothing is clear to me. But I'm sure I'll find the answer. This is not the first time I have encountered difficulties. I also see it affecting uMatrix as well.

My understanding is that when you enable the "Disable reading from HTML5 Canvas" option, the browser blocks access to the Canvas API for all scripts, including those that use extensions to change icons. I should think...