Web: support Firefox `privacy.resistFingerprinting` #5302

Job	Run time
Run cargo-deny on Android	21s
Check formatting	11s
Run cargo-deny on iOS	22s
Run cargo-deny on Linux	31s
Test stable Windows 64bit MSVC	1m 48s
Run cargo-deny on macOS	21s
Test stable Windows 32bit MSVC	1m 56s
Run cargo-deny on Redox OS	21s
Test stable Windows 64bit GNU	2m 12s
Run cargo-deny on web	20s
Test stable Windows 32bit GNU	1m 57s
Run cargo-deny on Windows	24s
Test stable Linux 32bit	2m 46s
Test stable Linux 64bit	2m 31s
Test stable X11	2m 24s
Test stable Wayland	2m 24s
Test stable Android	1m 7s
Test stable Redox OS	39s
Test stable macOS	2m 8s
Test stable iOS x86_64	1m 21s
Test stable iOS Aarch64	4m 23s
Test stable web	1m 9s
Test nightly Windows 64bit MSVC	1m 49s
Test nightly Windows 32bit MSVC	1m 47s
Test nightly Windows 64bit GNU	2m 9s
Test nightly Windows 32bit GNU	2m 9s
Test nightly Linux 32bit	2m 44s
Test nightly Linux 64bit	2m 40s
Test nightly X11	2m 27s
Test nightly Wayland	2m 34s
Test nightly Android	1m 10s
Test nightly Redox OS	30s
Test nightly macOS	1m 50s
Test nightly iOS x86_64	1m 26s
Test nightly iOS Aarch64	2m 4s
Test nightly web	59s
Test 1.70.0 Windows 64bit MSVC	1m 13s
Test 1.70.0 Windows 32bit MSVC	1m 2s
Test 1.70.0 Windows 64bit GNU	1m 28s
Test 1.70.0 Windows 32bit GNU	1m 3s
Test 1.70.0 Linux 32bit	1m 37s
Test 1.70.0 Linux 64bit	1m 13s
Test 1.70.0 X11	1m 9s
Test 1.70.0 Wayland	1m 4s
Test 1.70.0 Redox OS	22s
Test 1.70.0 macOS	1m 3s
Test 1.70.0 iOS x86_64	1m 28s
Test 1.70.0 iOS Aarch64	1m 0s
Test 1.70.0 web	38s
Test 1.70.0 Android	43s
Test nightly web Atomic	1m 14s
	1h 14m 11s

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