initial draft

.editorconfig

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+# Editor configuration, see http://editorconfig.org
+root = true
+
+[*]
+charset = utf-8
+indent_style = tab
+indent_size = 4
+insert_final_newline = true
+trim_trailing_whitespace = true
+end_of_line = lf
+
+[*.md]
+max_line_length = off
+trim_trailing_whitespace = false

.gitignore

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+/.project

.jscsrc

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+{
+    "requireCurlyBraces": [
+        "if",
+        "else",
+        "for",
+        "while",
+        "do",
+        "try",
+        "catch"
+    ],
+    "requireSpaceAfterKeywords": [
+        "if",
+        "else",
+        "for",
+        "while",
+        "do",
+        "switch",
+        "case",
+        "return",
+        "try",
+        "catch"
+    ],
+    "requireSpaceBeforeBlockStatements": true,
+    "requireParenthesesAroundIIFE": true,
+    "requireSpacesInConditionalExpression": true,
+    "disallowSpacesInNamedFunctionExpression": {
+        "beforeOpeningRoundBrace": true
+    },
+    "disallowSpacesInFunctionDeclaration": {
+        "beforeOpeningRoundBrace": true
+    },
+    "requireSpaceBetweenArguments": true,
+    "disallowMultipleVarDecl": true,
+    "requireVarDeclFirst": false,
+    "requireBlocksOnNewline": false,
+    "disallowEmptyBlocks": true,
+    "disallowSpacesInsideArrayBrackets": true,
+    "disallowSpacesInsideParentheses": true,
+    "disallowDanglingUnderscores": false,
+    "requireCommaBeforeLineBreak": true,
+    "disallowSpaceAfterPrefixUnaryOperators": true,
+    "disallowSpaceBeforePostfixUnaryOperators": true,
+    "disallowSpaceBeforeBinaryOperators": [
+        ","
+    ],
+    "requireSpacesInForStatement": true,
+    "requireSpacesInAnonymousFunctionExpression": {
+        "beforeOpeningCurlyBrace": true
+    },
+    "requireSpaceBeforeBinaryOperators": true,
+    "requireSpaceAfterBinaryOperators": true,
+    "disallowKeywords": [
+        "with"
+    ],
+    "validateIndentation": "\t",
+    "disallowMixedSpacesAndTabs": true,
+    "disallowTrailingWhitespace": true,
+    "disallowTrailingComma": true,
+    "disallowKeywordsOnNewLine": [
+        "else"
+    ],
+    "requireLineFeedAtFileEnd": true,
+    "requireCapitalizedConstructors": true,
+    "requireDotNotation": false,
+    "disallowNewlineBeforeBlockStatements": true,
+    "disallowMultipleLineStrings": true,
+    "requireSpaceBeforeObjectValues": true
+}

README.md

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+# colortabgroups
+
+## What it does
+
+color tabs based on their parent.

src/bg.js

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+var getFavicon = function(){
+	var favicon = undefined;
+	var nodeList = document.getElementsByTagName("link");
+	for (var i = 0; i < nodeList.length; i++)
+	{
+		if ((nodeList[i].getAttribute("rel") == "icon") || (nodeList[i].getAttribute("rel") == "shortcut icon")) {
+			favicon = nodeList[i].getAttribute("href");
+		}
+	}
+	return favicon;
+}
+
+var changeIcon = function(color) {
+	var canvas = document.createElement('canvas');
+	canvas.width = 16;
+	canvas.height = 16;
+	var ctx = canvas.getContext('2d');
+	var img = new Image();
+	img.src = getFavicon();
+	img.onload = function() {
+		ctx.drawImage(img, 0, 0);
+		ctx.fillStyle = color;
+		ctx.fillRect(0, 0, 2, 16);
+
+		var link = document.createElement('link');
+		link.type = 'image/x-icon';
+		link.rel = 'shortcut icon';
+		link.href = canvas.toDataURL("image/x-icon");
+		document.getElementsByTagName('head')[0].appendChild(link);
+	}
+}
+
+var generateRandomColor = function(seed) {
+	var selectColor = function (colorNum, colors){
+		if (colors < 1) {
+			colors = 1; // defaults to one color - avoid divide by zero
+		}
+		return "hsl(" + (colorNum * (360 / colors) % 360) + ",100%,50%)";
+	}
+
+	return selectColor(seed, 8);
+}
+
+changeIcon(generateRandomColor(1));

src/manifest.json

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+{
+  "description": "color tabs based on their parent.",
+  "manifest_version": 2,
+  "name": "colortabgroups",
+  "version": "0.0.1",
+  "homepage_url": "https://git.e.tern.al/s2/colortabgroups",
+}