1460145 - privacy.resistfingerprinting breaks the square selection on the HOT Tasking Manager

Status: RESOLVED DUPLICATE of bug 1446472

(Core :: DOM: Security, defect, P2)

Description

[François Marier [:francois]]

When privacy.resistfingerprinting is ON, the square selection tool on https://tasks.hotosm.org/project/4032?task=174 is really annoying to use since clicking a square selects a different neighboring one.

I assume that resistfingerprinting messes up the mouse event that this mapping app requires.

Comment 1

[Ethan Tseng [:ethan]]

As far as I know, we have not done anything to mouse event regarding fingerprinting resistance.
This issue seems to be a side effect of something else.

Note:
I can reproduce this bug on Firefox Nightly 65, but not on Tor Browser 8.

Comment 2

[Tim Huang[:timhuang]]

I can confirm that the square selection tool works fine if the canvas permission is granted in RFP mode. So, I think the square selection tool needs the canvas data in order to work properly. But the canvas auto-blocking has blocked the extraction of canvas data which breaks this tool.

After Bug 1446472, there will be a canvas icon alongside the url bar, an identity block icon, if the canvas auto-blocking happens. So people can grant the canvas permission through clicking the icon and make the website works again after refreshing the page.