Fixed bug in CONSTANT VIGILANCE feature

src/contentScript.js

 	var observer = new MutationObserver((mutationsList, observer) => {
 		var shouldKillSticky = false;
 		for (var mutation of mutationsList) {
-			if (mutation.target.style.position == 'fixed' ||
-				mutation.target.style.position == 'sticky')
+			if (getComputedStyle(mutation.target).position == 'fixed' ||
+				getComputedStyle(mutation.target).position == 'sticky')
 				shouldKillSticky = true;
 		}
 		if (shouldKillSticky)