feat: enable custom wallpapers on about:newtab

browser/extensions/newtab/lib/WallpaperFeed.sys.mjs

@@ -129,19 +129,22 @@ export class WallpaperFeed {
     }
 
     // retrieving all records in collection
-    const records = await this.wallpaperClient.get();
+    let records = [];
-    if (!records?.length) {
+    let baseAttachmentURL = "";
-      return;
-    }
 
     const customWallpaperEnabled = Services.prefs.getBoolPref(
       PREF_WALLPAPERS_CUSTOM_WALLPAPER_ENABLED
     );
 
-    const baseAttachmentURL = await lazy.Utils.baseAttachmentsURL();
+    const customColorEnabled = Services.prefs.getBoolPref(
+      "browser.newtabpage.activity-stream.newtabWallpapers.customColor.enabled"
+    );
 
-    const wallpapers = [
+    let wallpapers = [];
-      ...records.map(record => {
+
+    // Process records if we have any
+    if (records && records.length > 0 && baseAttachmentURL) {
+      wallpapers = records.map(record => {
         return {
           ...record,
           ...(record.attachment
@@ -151,16 +154,42 @@ export class WallpaperFeed {
             : {}),
           category: record.category || "",
         };
-      }),
+      });
-    ];
+    }
 
-    const categories = [
+    // Build categories
+    let categories = [
       ...new Set(
         wallpapers.map(wallpaper => wallpaper.category).filter(Boolean)
       ),
-      ...(customWallpaperEnabled ? ["custom-wallpaper"] : []), // Conditionally add custom wallpaper input
     ];
 
+    // Always add solid-colors if custom color is enabled and not already present
+    if (customColorEnabled && !categories.includes("solid-colors")) {
+      categories.push("solid-colors");
+
+      // Add default solid colors if we have no wallpapers
+      if (wallpapers.length === 0) {
+        wallpapers = [
+          { title: "red-30", solid_color: "#ff7e8e", category: "solid-colors" },
+          { title: "orange-30", solid_color: "#ff8f31", category: "solid-colors" },
+          { title: "yellow-30", solid_color: "#f1af00", category: "solid-colors" },
+          { title: "green-30", solid_color: "#61cc69", category: "solid-colors" },
+          { title: "cyan-30", solid_color: "#00cadb", category: "solid-colors" },
+          { title: "blue-30", solid_color: "#60adff", category: "solid-colors" },
+          { title: "violet-30", solid_color: "#b295ff", category: "solid-colors"},
+          { title: "purple-30", solid_color: "#d98dfa", category: "solid-colors"},
+          { title: "pink-30", solid_color: "#ff7ead", category: "solid-colors"}
+        ];
+      }
+    }
+
+    // Always add custom-wallpaper if enabled
+    if (customWallpaperEnabled) {
+      categories.push("custom-wallpaper");
+    }
+
+    // Dispatch even with empty wallpapers as long as we have categories
     this.store.dispatch(
       ac.BroadcastToContent({
         type: at.WALLPAPERS_SET,