fixup! Bug 41631: Prevent weird initial window dimensions caused by subpixel computations

toolkit/components/resistfingerprinting/RFPHelper.sys.mjs

@@ -314,8 +314,10 @@ class _RFPHelper {
       kPrefLetterboxing,
       false
     );
+    if (this.rfpEnabled) {
       forEachWindow(win => this._updateSizeForTabsInWindow(win));
     }
+  }
 
   // The function to parse the dimension set from the pref value. The pref value
   // should be formated as 'width1xheight1, width2xheight2, ...'. For