Ver 1.0

content.js

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+let brandejsMucitel = browser.runtime.getURL("assets/brandejsMucitel.jpg");
+let brandejsVino = browser.runtime.getURL("assets/brandejsWine.jpg");
+let brandejsMinecraft = browser.runtime.getURL("assets/brandejsMC.jpg");
+let brandejsMatrix = browser.runtime.getURL("assets/brandejsMatrix.jpg");
+let brandejsNeon = browser.runtime.getURL("assets/brandejsNeon.jpg");
+
+let photos = [brandejsMucitel, brandejsVino, brandejsMinecraft, brandejsMatrix, brandejsNeon];
+
+let rng = Math.floor(Math.random() * photos.length);
+
+let main_menu_css = `    
+    #content.motiv-titulka {
+        background-image: url('${photos[rng]}');
+        background-repeat: no-repeat;
+        background-position: 75% 0;
+        background-size: 550px auto;
+    }`
+
+let app_css = `
+    #app_header_image {
+        background-image: url('${photos[rng]}');
+        background-size: auto 100%;
+        background-position: 462px;
+        display: block !important;
+        top: -195px;
+    }
+    #app_header_image::after {
+        background-image:  none;
+    }
+    #app_menu.empty { background-color: transparent }`
+
+let other_css = `
+    ul.is-switch { float: left; }
+    #prepinace > ul > li > a { text-align: left; }
+    #app_menu.empty { background-color: transparent; }
+    .zivot_column { margin-top: 120px; }
+    .motiv-titulka .app_header_motiv_switch { 
+        float: none;
+        right: 0;
+        top: 0 !important; }
+    .ikony { 
+        float: left;
+        padding-left: 25%;
+        background-color: rgba(255, 255, 255, 0.7);
+        border-radius: 20px; }`
+
+let style = document.getElementsByTagName("style");
+if (style.length == 0) {
+    document.head.innerHTML += "<style>" + app_css + other_css + "</style>";
+}
+else {
+    let main_page = document.getElementsByClassName("motiv-titulka");
+    if (main_page.length == 0) {
+        style[0].innerHTML += app_css + other_css;
+    }
+    else {
+        style[0].innerHTML += main_menu_css + other_css;
+    }
+}
+
+

manifest.json

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+{
+    "manifest_version": 2,
+
+    "name": "Custom Brandejs theme for IS",
+    "version": "1.0",
+    "description": "The only proper way to enjoy MUNI IS (shamelessly stolen)",
+
+    "browser_specific_settings": {
+        "gecko": {
+            "id": "aaaaaa@aaaaa"
+        }
+    },
+    "content_scripts": [
+        {
+            "matches": ["https://is.muni.cz/auth/*"],
+            "js": ["content.js"]
+        }
+    ],
+    "web_accessible_resources": [
+        "assets/brandejsMatrix.jpg",
+        "assets/brandejsMC.jpg",
+        "assets/brandejsWine.jpg",
+        "assets/brandejsMucitel.jpg",
+        "assets/brandejsNeon.jpg"
+    ]
+}