Inject the CSS using browser.tabs.injectCSS();

webextension/background.js

@@ -55,7 +55,7 @@ function onStorageChanged(changes) {
 
 browser.runtime.onMessage.addListener(onLaunch);
 
-function onLaunch(opts) {
+function onLaunch(opts, sender) {
   const title = opts.title;
   delete opts.title;
 
@@ -76,4 +76,13 @@ function onLaunch(opts) {
 
     launchVideo(opts);
   } else if (title === 'metric') sendMetricsData(opts);
+  else if (title === 'inject-style') {
+    if ('tab' in sender) {
+      browser.tabs.insertCSS(sender.tab.id, {
+        file: '/content-scripts/icon-overlay.css',
+        frameId: opts.frameId,
+        runAt: 'document_start'
+      });
+    }
+  }
 }

webextension/content-scripts/icon-overlay.css

@@ -0,0 +1,84 @@
+.minvid__overlay__bottom_container {
+  align-items: center;
+  background-color: rgba(0,0,0,0.8);
+  opacity: 0;
+  border-radius: 0 0 4px 4px;
+  height: 100%;
+  justify-content: center;
+  left: 4%;
+  max-height: 80px;
+  max-width: 36px;
+  padding: 2px 2px 4px;
+  position: absolute;
+  bottom: 0;
+  width: 100%;
+  z-index: 1000;
+}
+
+.minvid__overlay__container {
+    align-items: center;
+    background-color: rgba(0,0,0,0.8);
+    opacity: 0;
+    border-radius: 0 0 4px 4px;
+    height: 100%;
+    justify-content: center;
+    left: 4%;
+    max-height: 80px;
+    max-width: 36px;
+    padding: 2px 2px 4px;
+    position: absolute;
+    top: 0;
+    width: 100%;
+    z-index: 1000;
+}
+
+.minvid__overlay__container:hover,
+.minvid__overlay__bottom_container:hover {
+    background: rgba(0,0,0,0.9);
+}
+
+.minvid__overlay__icon {
+    display: block;
+    cursor: pointer;
+    height: 40%;
+    opacity: 0.7;
+    width: 100%;
+}
+
+#minvid__overlay__icon__play {
+  background: url("data:image/svg+xml;base64,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") no-repeat;
+  background-position: center bottom;
+  background-size: 32px auto;
+}
+
+#minvid__overlay__icon__add {
+  background: url("data:image/svg+xml;base64,PHN2ZyB3aWR0aD0iMTQiIGhlaWdodD0iMTQiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyI+PHBhdGggZD0iTTguNCA1LjZWMEg1LjZ2NS42SDB2Mi44aDUuNlYxNGgyLjhWOC40SDE0VjUuNnoiIGZpbGw9ImNvbnRleHQtZmlsbCAjRkZGIiBmaWxsLXJ1bGU9ImV2ZW5vZGQiLz48L3N2Zz4=") no-repeat;
+  background-position: center bottom;
+  background-size: 25px auto;
+  margin-top: 5px;
+}
+
+.minvid__overlay__wrapper:hover .minvid__overlay__container,
+.minvid__overlay__wrapper:hover .minvid__overlay__bottom_container {
+    opacity: 1;
+    /*background-color: rgba(0, 0, 0, .8);*/
+    /*animation-name: fade;
+    animation-duration: 4s;
+    animation-iteration-count: initial;
+    animation-fill-mode: forwards;*/
+}
+
+#minvid__overlay__icon__play:hover,
+#minvid__overlay__icon__add:hover {
+    opacity: 1;
+}
+
+.minvid__overlay__container.fullscreen {
+  display: none;
+}
+
+@keyframes fade {
+  0%   {opacity: 0}
+  5%, 80% {opacity: 1}
+  100% {opacity: 0}
+}

webextension/content-scripts/icon-overlay.js

@@ -428,103 +428,7 @@ function closeFullscreen() {
 }
 
 function injectStyle() {
-  const css = `
-.minvid__overlay__bottom_container {
-  align-items: center;
-  background-color: rgba(0,0,0,0.8);
-  opacity: 0;
-  border-radius: 0 0 4px 4px;
-  height: 100%;
-  justify-content: center;
-  left: 4%;
-  max-height: 80px;
-  max-width: 36px;
-  padding: 2px 2px 4px;
-  position: absolute;
-  bottom: 0;
-  width: 100%;
-  z-index: 1000;
-}
-
-.minvid__overlay__container {
-    align-items: center;
-    background-color: rgba(0,0,0,0.8);
-    opacity: 0;
-    border-radius: 0 0 4px 4px;
-    height: 100%;
-    justify-content: center;
-    left: 4%;
-    max-height: 80px;
-    max-width: 36px;
-    padding: 2px 2px 4px;
-    position: absolute;
-    top: 0;
-    width: 100%;
-    z-index: 1000;
-}
-
-.minvid__overlay__container:hover,
-.minvid__overlay__bottom_container:hover {
-    background: rgba(0,0,0,0.9);
-}
-
-.minvid__overlay__icon {
-    display: block;
-    cursor: pointer;
-    height: 40%;
-    opacity: 0.7;
-    width: 100%;
-}
-
-#minvid__overlay__icon__play {
-  background: url("data:image/svg+xml;base64,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") no-repeat;
-  background-position: center bottom;
-  background-size: 32px auto;
-}
-
-#minvid__overlay__icon__add {
-  background: url("data:image/svg+xml;base64,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") no-repeat;
-  background-position: center bottom;
-  background-size: 25px auto;
-  margin-top: 5px;
-}
-
-.minvid__overlay__wrapper:hover .minvid__overlay__container,
-.minvid__overlay__wrapper:hover .minvid__overlay__bottom_container {
-    opacity: 1;
-    /*background-color: rgba(0, 0, 0, .8);*/
-    /*animation-name: fade;
-    animation-duration: 4s;
-    animation-iteration-count: initial;
-    animation-fill-mode: forwards;*/
-}
-
-#minvid__overlay__icon__play:hover,
-#minvid__overlay__icon__add:hover {
-    opacity: 1;
-}
-
-.minvid__overlay__container.fullscreen {
-  display: none;
-}
-
-@keyframes fade {
-  0%   {opacity: 0}
-  5%, 80% {opacity: 1}
-  100% {opacity: 0}
-}
-
-`;
-
-  const head = document.head;
-  const style = document.createElement('style');
-
-  style.type = 'text/css';
-  if (style.styleSheet) {
-    style.styleSheet.cssText = css;
-  } else {
-    style.appendChild(document.createTextNode(css));
-  }
-
-  head.appendChild(style);
+  browser.runtime.sendMessage({
+    title: 'inject-style'
+  });
 }

webextension/manifest.json

@@ -11,7 +11,6 @@
     {
       "matches": ["https://*.youtube.com/*", "https://vimeo.com/*", "https://soundcloud.com/*"],
       "js": ["content-scripts/icon-overlay.js"],
-      "css": ["content-scripts/icon-overlay.css"],
       "all_frames": true
     }
   ],