Memory leaks occur when using the extension on certain whitelist sites.

[Iz-zzzzz]

CanvasBlocker extension causes memory leaks on some sites, such as youtube.com, mail.google.com, and translate.google.com, etc.

Description (How to reproduce on youtube.com)

1. Install new fresh Firefox profile
2. Set Enhanced Tracking Protection to Strict (Enable FPP)
3. Install latest version of CanvasBlocker from CanvasBlocker Beta
4. Add youtube.com,google.com to CanvasBlocker's whilelist
5. Go to video page on youtube.com -> clear site data/click next video/backward/refresh/hard refresh/terminate web process until noticing page is freeze.
6. Go to about:processes to see memory using more than usual (up to 5 GB)

Note

• Possibility to get memory leak on Windows is about 30%, and 80% on Android according to my tests.

Expected Behaviour

CPU and Memory usage should be normal.

Current Behaviour

Firefox 133.0.3 64-bit Windows 11

2024-12-28.00-42-55.mp4

Firefox 134 Beta on Android 13

Screen_Recording_20241227_033618.mp4

Possible Solution

• Restart related web processes
• Completely disable CanvasBlocker

Context

I have been testing in various environments to identify what exactly causes the issue(which part of FPP or CanvasBlocker), but I still cannot figure it out. I think I need help from others.

Your Environment

• CanvasBlocker Version used: Version 1.11.20241222
• Firefox 133.0.3 64-bit Windows 10, 11(Intel i5 Gen9) and Firefox 134 Beta on Android 12, 13, and 14
• Installed addons: CanvasBlocker beta
• ETP strict mode.
• Browser Privacy > Website Privacy Preferences
  • Tell websites not to sell or share my data
  • Send websites a “Do Not Track” request

Your Settings

Stock setting but add youtube.com,google.com to CanvasBlocker's whilelist.

{
	"logLevel": 1,
	"urlSettings": [],
	"hiddenSettings": {},
	"expandStatus": {},
	"displayHiddenSettings": false,
	"whiteList": "youtube.com,google.com",
	"sessionWhiteList": "",
	"blackList": "",
	"blockMode": "fake",
	"protectedCanvasPart": "readout",
	"minFakeSize": 1,
	"maxFakeSize": 0,
	"rng": "nonPersistent",
	"protectedAPIFeatures": {},
	"useCanvasCache": true,
	"ignoreFrequentColors": 0,
	"minColors": 0,
	"fakeAlphaChannel": false,
	"webGLVendor": "",
	"webGLRenderer": "",
	"webGLUnmaskedVendor": "",
	"webGLUnmaskedRenderer": "",
	"persistentRndStorage": "",
	"persistentIncognitoRndStorage": "",
	"storePersistentRnd": false,
	"persistentRndClearIntervalValue": 0,
	"persistentRndClearIntervalUnit": "days",
	"lastPersistentRndClearing": 1735298609352,
	"sharePersistentRndBetweenDomains": false,
	"askOnlyOnce": "individual",
	"askDenyMode": "block",
	"showCanvasWhileAsking": true,
	"showNotifications": true,
	"highlightPageAction": "none",
	"highlightBrowserAction": "color",
	"displayBadge": true,
	"storeNotificationData": false,
	"storeImageForInspection": false,
	"ignoreList": "",
	"ignoredAPIs": {},
	"showCallingFile": false,
	"showCompleteCallingStack": false,
	"enableStackList": false,
	"stackList": "",
	"protectAudio": true,
	"audioFakeRate": "100",
	"audioNoiseLevel": "minimal",
	"useAudioCache": true,
	"audioUseFixedIndices": true,
	"audioFixedIndices": "25",
	"historyLengthThreshold": 2,
	"protectWindow": false,
	"allowWindowNameInFrames": false,
	"protectDOMRect": true,
	"domRectIntegerFactor": 4,
	"protectSVG": true,
	"protectTextMetrics": true,
	"blockDataURLs": false,
	"protectNavigator": false,
	"navigatorDetails": {},
	"protectScreen": true,
	"screenSize": "",
	"fakeMinimalScreenSize": true,
	"displayAdvancedSettings": true,
	"displayDescriptions": false,
	"theme": "auto",
	"showPresetsOnInstallation": true,
	"dontShowOptionsOnUpdate": false,
	"disruptSessionOnUpdate": false,
	"updatePending": false,
	"isStillDefault": false,
	"storageVersion": 1
}