diff --git a/chrome/content/zotero/xpcom/data/tags.js b/chrome/content/zotero/xpcom/data/tags.js
index 6f13e314c6..898cc231d5 100644
--- a/chrome/content/zotero/xpcom/data/tags.js
+++ b/chrome/content/zotero/xpcom/data/tags.js
@@ -840,162 +840,6 @@ Zotero.Tags = new function () {
 	};
 	
 	
-	/**
-	 * A tree cell can show only one image, and (as of Fx19) it can't be an SVG,
-	 * so we need to generate a composite image containing the existing item type
-	 * icon and one or more tag color swatches.
-	 *
-	 * @params {String[]} colors - Array of swatch colors
-	 * @params {String} extraImage - chrome:// URL of image to add to final image
-	 * @params {Boolean} [retracted = false] - If true, show an icon indicating the item was retracted
-	 * @return {Promise<String>} - A promise for a data: URL for a PNG
-	 */
-	this.generateItemsListImage = async function (colors, extraImage, retracted) {
-		var multiplier = Zotero.hiDPI ? 2 : 1;
-		
-		var canvasHeight = 16 * multiplier;
-		var extraImageWidth = 16 * multiplier;
-		var extraImageHeight = 16 * multiplier;
-		var retractionImage = `chrome://zotero/skin/cross${Zotero.hiDPI ? '@1.5x' : ''}.png`;
-		var retractionImageLeftPadding = 1 * multiplier;
-		var retractionImageWidth = 16 * multiplier;
-		var retractionImageHeight = 16 * multiplier;
-		var retractionImageScaledWidth = 12 * multiplier;
-		var retractionImageScaledHeight = 12 * multiplier;
-		var tagsLeftPadding = 3 * multiplier;
-		var swatchSeparator = 3 * multiplier;
-		var swatchWidth = 8 * multiplier;
-		var swatchHeight = 8 * multiplier;
-		
-		var hash = colors.join("") + (extraImage ? extraImage : "") + (retracted ? "retracted" : "");
-		
-		if (_itemsListImagePromises[hash]) {
-			return _itemsListImagePromises[hash];
-		}
-		
-		var win = Components.classes["@mozilla.org/appshell/appShellService;1"]
-			.getService(Components.interfaces.nsIAppShellService)
-			.hiddenDOMWindow;
-		var doc = win.document;
-		var canvas = doc.createElement('canvas');
-		
-		var width = extraImageWidth
-			+ (retracted
-				? (retractionImageLeftPadding
-					+ ((retractionImageWidth - retractionImageScaledWidth) / 2)
-					+ retractionImageScaledWidth)
-				: 0)
-			+ (colors.length ? tagsLeftPadding : 0)
-			+ (colors.length * (swatchWidth + swatchSeparator));
-		
-		canvas.width = width;
-		canvas.height = canvasHeight;
-		var swatchTop = Math.floor((canvasHeight - swatchHeight) / 2);
-		var ctx = canvas.getContext('2d');
-		
-		// If extra image hasn't started loading, start now
-		if (_itemsListImagePromises[extraImage] === undefined) {
-			let ios = Services.io;
-			let uri = ios.newURI(extraImage, null, null);
-			let img = new win.Image();
-			img.src = uri.spec;
-			_itemsListImagePromises[extraImage] = new Zotero.Promise((resolve) => {
-				img.onload = function () {
-					resolve(img);
-				};
-			});
-		}
-		
-		// If retraction image hasn't started loading, start now
-		if (_itemsListImagePromises[retractionImage] === undefined) {
-			let ios = Services.io;
-			let uri = ios.newURI(retractionImage, null, null);
-			let img = new win.Image();
-			img.src = uri.spec;
-			_itemsListImagePromises[retractionImage] = new Zotero.Promise((resolve) => {
-				img.onload = function () {
-					resolve(img);
-				};
-			});
-		}
-		
-		var x = extraImageWidth
-			+ (retracted ? retractionImageLeftPadding + retractionImageWidth: 0)
-			+ tagsLeftPadding;
-		for (let i = 0, len = colors.length; i < len; i++) {
-			ctx.fillStyle = colors[i];
-			_canvasRoundRect(ctx, x, swatchTop + 1, swatchWidth, swatchHeight, 2, true, false);
-			x += swatchWidth + swatchSeparator;
-		}
-		
-		if (retracted) {
-			let [img1, img2] = await Promise.all([
-				_itemsListImagePromises[extraImage],
-				_itemsListImagePromises[retractionImage]
-			]);
-			ctx.drawImage(img1, 0, 0, extraImageWidth, extraImageHeight);
-			ctx.drawImage(
-				img2,
-				extraImageWidth + retractionImageLeftPadding
-					+ ((retractionImageWidth - retractionImageScaledWidth) / 2),
-				(retractionImageHeight - retractionImageScaledHeight) / 2 + 1, // Lower by 1
-				retractionImageScaledWidth,
-				retractionImageScaledHeight
-			);
-		}
-		else {
-			let img = await _itemsListImagePromises[extraImage];
-			ctx.drawImage(img, 0, 0, extraImageWidth, extraImageHeight);
-		}
-		
-		var dataURI = canvas.toDataURL("image/png");
-		_itemsListImagePromises[hash] = Promise.resolve(dataURI);
-		return dataURI;
-	};
-	
-	
-	/**
-	 * From http://js-bits.blogspot.com/2010/07/canvas-rounded-corner-rectangles.html
-	 *
-	 * Draws a rounded rectangle using the current state of the canvas.
-	 * If you omit the last three params, it will draw a rectangle
-	 * outline with a 5 pixel border radius
-	 *
-	 * @param {CanvasRenderingContext2D} ctx
-	 * @param {Number} x The top left x coordinate
-	 * @param {Number} y The top left y coordinate
-	 * @param {Number} width The width of the rectangle
-	 * @param {Number} height The height of the rectangle
-	 * @param {Number} radius The corner radius. Defaults to 5;
-	 * @param {Boolean} fill Whether to fill the rectangle. Defaults to false.
-	 * @param {Boolean} stroke Whether to stroke the rectangle. Defaults to true.
-	 */
-	function _canvasRoundRect(ctx, x, y, width, height, radius, fill, stroke) {
-		if (typeof stroke == "undefined" ) {
-			stroke = true;
-		}
-		if (typeof radius === "undefined") {
-			radius = 5;
-		}
-		ctx.beginPath();
-		ctx.moveTo(x + radius, y);
-		ctx.lineTo(x + width - radius, y);
-		ctx.quadraticCurveTo(x + width, y, x + width, y + radius);
-		ctx.lineTo(x + width, y + height - radius);
-		ctx.quadraticCurveTo(x + width, y + height, x + width - radius, y + height);
-		ctx.lineTo(x + radius, y + height);
-		ctx.quadraticCurveTo(x, y + height, x, y + height - radius);
-		ctx.lineTo(x, y + radius);
-		ctx.quadraticCurveTo(x, y, x + radius, y);
-		ctx.closePath();
-		if (stroke) {
-			ctx.stroke();
-		}
-		if (fill) {
-			ctx.fill();
-		}
-	}
-
 	// Return the first sequence of emojis from a string
 	this.extractEmojiForItemsList = function (str) {
 		// Split by anything that is not an emoji, Zero Width Joiner, or Variation Selector-16