diff --git a/popup.js b/popup.js
index a91f09d..df53288 100644
--- a/popup.js
+++ b/popup.js
@@ -29,36 +29,64 @@ function toggleState() {
 		/*	In this case, stickies are NOT being killed. We must add a matching
 			pattern, and remove all applicable exclusion patterns. */
 			if (!ASK.pageMatched) {
-				ASK.matchingPatterns.push(regExpForCurrentTab());
+				addPatternForCurrentTab(ASK.matchingPatterns);
 			}
 			if (ASK.pageExcluded) {
-				ASK.exclusionPatterns = ASK.exclusionPatterns.filter(pattern =>
-					!ASK.activeTabLocation.match(new RegExp(pattern))
-				);
+				disablePatternsForCurrentTab(ASK.exclusionPatterns);
 			}
 		} else {
 		/*	In this case, stickies ARE being killed. We must remove all
 			applicable matching patterns. */
-			ASK.matchingPatterns = ASK.matchingPatterns.filter(pattern =>
-				!ASK.activeTabLocation.match(new RegExp(pattern))
-			);
+			disablePatternsForCurrentTab(ASK.matchingPatterns);
 		}
 	} else { // if whitelist mode
 		if (ASK.pageExcluded) {
 		/*	In this case, stickies are NOT being killed. We must remove all
 			applicable exclusion patterns. */
-			ASK.exclusionPatterns = ASK.exclusionPatterns.filter(pattern =>
-				!ASK.activeTabLocation.match(new RegExp(pattern))
-			);
+			disablePatternsForCurrentTab(ASK.exclusionPatterns);
 		} else {
 		/*	In this case, stickies ARE being killed. We must add an exclusion
 			pattern. */
-			ASK.exclusionPatterns.push(regExpForCurrentTab());
+			addPatternForCurrentTab(ASK.exclusionPatterns);
 		}
 	}
 	recalculatePatternEffects();
 }
 
+function addPatternForCurrentTab(patterns) {
+	/*	First, we see if there are already any existing but commented-out 
+		patterns that match the active tab. If so, we enable them all. */
+	var existingPatternsFound = false;
+	for (var i = 0; i < patterns.length; i++) {
+		if (patterns[i] && patterns[i].hasPrefix("#")) {
+			// Strip the leading comment characters and whitespace.
+			let uncommentedPattern = patterns[i].replace(/^#[#\s]*/, "");
+			// Check if the pattern matches the active tab’s URL.
+			if (ASK.activeTabLocation.match(new RegExp(uncommentedPattern))) {
+				// If so, replace the commented pattern.
+				patterns[i] = uncommentedPattern;
+				existingPatternsFound = true;
+			}
+		}
+	}
+	if (existingPatternsFound) return;
+
+	/*	If no existing but commented-out patterns have been found, then we’ve
+		got to add a new pattern. */
+	let dtf = new Intl.DateTimeFormat([], 
+		{ month: 'short', day: 'numeric', year: 'numeric', hour: 'numeric', minute: 'numeric', second: 'numeric' });
+	patterns.push("## " + dtf.format(new Date()) + " - " + ASK.activeTabLocation);
+	patterns.push(regExpForCurrentTab());
+	patterns.push("");
+}
+
+function disablePatternsForCurrentTab(patterns) {
+	for (var i = 0; i < patterns.length; i++) {
+		if (patterns[i] && ASK.activeTabLocation.match(new RegExp(patterns[i])))
+			patterns[i] = "# " + patterns[i];
+	}
+}
+
 function regExpForCurrentTab() {
 	let a = document.createElement("A");
 	a.href = ASK.activeTabLocation;