Autodetect 360 stereo projection (#2635)

Author: MortimerGoro

app/src/main/assets/web_extensions/webcompat_vimeo/main.js

@@ -331,6 +331,10 @@ try {
             if (newObjData.name === 'window.vimeo.clip_page_config') {
               if (configObj.clip.canvas === 1 || configObj.clip.is_spatial === true) {
                 is360 = true;
+                // Detect 360 stereo videos
+                if (configObj.clip.title.toLowerCase().indexOf('stereo') >= 0) {
+                    QS_DEFAULTS.mozVideoProjection = "360s_auto";
+                }
               }
 
               configObj.clip.canvas = 1;

app/src/main/assets/web_extensions/webcompat_youtube/main.js

@@ -87,9 +87,10 @@ class YoutubeExtension {
             document.querySelector(YT_SELECTORS.disclaimer),
             document.querySelector(YT_SELECTORS.embedTitle)
         ];
-        let is360 = targets.some((node) => node && node.textContent.includes('360'));
+        const is360 = targets.some((node) => node && node.textContent.includes('360'));
         if (is360) {
-            qs.set('mozVideoProjection', '360_auto');
+            const stereo = targets.some((node) => node && node.textContent.toLowerCase().includes('stereo'));
+            qs.set('mozVideoProjection', stereo ? '360s_auto' : '360_auto');
             this.updateURL(qs);
             this.updateVideoStyle();
             logDebug(`Video projection set to: ${qs.get(VIDEO_PROJECTION_PARAM)}`);