Redesigned core functionality implementation

src/contentScript.js

 			if (getComputedStyle(mutation.target).position == 'fixed' ||
 				getComputedStyle(mutation.target).position == 'sticky') {
 				mutation.target.remove();
-				console.log("Killing new sticky!");
+				console.log("Killing a sticky!");
+
+				// Compensate for fullscreen paywalls.
+				restoreScrollability();
 			}
 		}
 	});
 
-	observer.observe(document.querySelector("body"), {
+	observer.observe(document.querySelector("html"), {
 		attributes: true, 
 		childList: true, 
 		subtree: true
 /******************/
 
 function initialize() {
-	chrome.storage.sync.get([ "matchingPatterns", "exclusionPatterns", "mode", "constantVigilance" ],
+	chrome.storage.sync.get([ "matchingPatterns", "exclusionPatterns", "mode" ],
 	(result) => {
 		let shouldKillSticky = checkForShouldKillSticky(result);
 		updateIcon(shouldKillSticky);
-		let constantVigilance = (result.constantVigilance == "false") ? false : true;
-		window.onload = () => {
-			if (shouldKillSticky) {
+		if (shouldKillSticky) {
+			startConstantVigilance();
+			window.onload = () => {
 				killSticky();
-				if (constantVigilance) startConstantVigilance();
 			}
-		};
+		}
 	});
 }
 initialize();

src/functions.js

 			element.remove();
 		}
 	});
+	// Compensate for full-screen paywalls.
+	restoreScrollability();
+}
+
+/*	Full-screen paywalls not only bring up sticky elements, they also make
+	the page un-scrollable. This ensures that the page remains scrollable.
+	*/
+function restoreScrollability() {
+	document.querySelectorAll("html, body").forEach(container => {
+		container.style.setProperty("overflow-y", "auto", "important");
+	});
 }

src/options.css

 	border-bottom: 1px solid currentColor;
 }
 
-/**********************/
-/* CONSTANT VIGILANCE */
-/**********************/
-
-.constant-vigilance-container {
-	border: 1px solid #ddd;
-	padding: 9px 13px 12px 11px;
-	display: flex;
-	align-items: center;
-	margin: 0 0 0 10px;
-}
-
-.constant-vigilance-container input[type='checkbox'] {
-	-webkit-appearance: none;
-	-moz-appearance: none;
-	border: 1px solid #000;
-	width: 15px;
-	height: 15px;
-	position: relative;
-	top: 1px;
-	margin: 3px 5px 0 0;
-}
-.constant-vigilance-container input[type='checkbox'],
-.constant-vigilance-container label {
-	cursor: pointer;
-}
-.constant-vigilance-container label {
-	line-height: 1;
-	padding: 8px 0 0 0;
-	border-bottom: 1px solid transparent;
-	font-size: 0.875rem;
-}
-.constant-vigilance-container label::selection {
-	background-color: transparent;
-}
-.constant-vigilance-container input[type='checkbox']:focus {
-	outline: none;
-}
-.constant-vigilance-container input[type='checkbox']:focus + label,
-.constant-vigilance-container input[type='checkbox']:hover + label,
-.constant-vigilance-container input[type='checkbox'] + label:hover {
-	border-bottom: 1px dotted #000;
-}
-.constant-vigilance-container input[type='checkbox']:checked,
-.constant-vigilance-container input[type='checkbox']:hover {
-	box-shadow: 0 0 0 2px #fff inset;
-}
-.constant-vigilance-container input[type='checkbox']:hover {
-	background-color: #ccc;
-}
-.constant-vigilance-container input[type='checkbox']:checked {
-	background-color: #000;
-}
-
 /******************/
 /* WHITELIST MODE */
 /******************/

src/options.html

 			<input type='checkbox' id='whitelist-mode'></input>
 			<span class='whitelist-mode-label'>Whitelist mode</span>
 		</span>
-		<span class='constant-vigilance-container'>
-			<input type='checkbox' name='constant-vigilance' id='constant-vigilance' checked></input>
-			<label for='constant-vigilance' title='Continue monitoring the page for sticky elements added after page load. (See help for more info.)'>CONSTANT VIGILANCE!</label>
-		</span>
 		<span class='buttons'>
 			<button disabled type='button' class='reset-button'>Reset</button>
 			<button disabled type='button' class='save-button'>Save</button>
 			<h3>Whitelist mode</h3>
 			<p>In <strong>whitelist mode</strong>, <em>the matching patterns list is ignored</em>. Stickies are <em>always</em> killed, <em>unless</em> the page matches one of the patterns in the <strong>exclusion patterns</strong> list.</p>
 			<p>(In whitelist mode, the behavior of the main button (<span class='fa fa-heavy'>&#xf08d;</span>) in the AlwaysKillSticky popup is reversed.)</p>
-			<h2>Constant vigilance</h2>
-			<p>Some websites add sticky elements after loading, or make existing elements sticky (either on a timer, or based on user actions). CONSTANT VIGILANCE 	counteracts this behavior, by watching the DOM for mutations, and, if	necessary, killing any newly-formed stickies.</p>
-			<p>This feature may slightly impact browser performance on some sites or some computers. If you disable it, stickies will still be killed immediately upon page load, but not thereafter.</p>
 			<h2>Advanced usage</h2>
 			<p>AlwaysKillSticky automatically manages the lists of matching and exclusion patterns. When you enable or disable sticky-killing for a site (by clicking the big button in the AlwaysKillSticky popup), the pattern lists are automatically modified appropriately. There is usually no need to edit the lists yourself.</p>
 			<p>However, if you prefer more fine-grained control (e.g., if you want to kill stickies on all sites on a domain, or if you want to exclude specific paths of a site), you can edit the pattern lists by hand. The matching and exclusion patterns are <a href='https://en.wikipedia.org/wiki/Regular_expression' rel='nofollow' target='_blank'>regular expressions</a> (a.k.a. “regexps”). (The site <a href='https://regexr.com/' rel='nofollow' target='_blank'>RegExr.com</a> is useful if you are not entirely familiar with how regexps work—or even if you are.)</p>

src/options.js

 	let matchingPatterns = document.querySelector("#matchingPatterns textarea").value;
 	let exclusionPatterns = document.querySelector("#exclusionPatterns textarea").value;
 	let mode = document.querySelector("input#whitelist-mode").checked ? "whitelist" : "blacklist";
-	let constantVigilance = document.querySelector("input#constant-vigilance").checked ? "true" : "false";
 	chrome.storage.sync.set({
 		"matchingPatterns": matchingPatterns,
 		"exclusionPatterns": exclusionPatterns,
-		"mode": mode,
-		"constantVigilance": constantVigilance
+		"mode": mode
 	}, () => { setButtonsActive(false); });
 }
 
 	discarding the user's changes.
 	*/
 function resetChanges(callback) {
-	chrome.storage.sync.get([ "matchingPatterns", "exclusionPatterns", "mode", "constantVigilance" ], (result) => {
+	chrome.storage.sync.get([ "matchingPatterns", "exclusionPatterns", "mode" ], (result) => {
 		AKS.matchingPatterns = result.matchingPatterns || "";
 		AKS.exclusionPatterns = result.exclusionPatterns || ""
 		AKS.mode = result.mode || "blacklist";
-		AKS.constantVigilance = result.constantVigilance || "true";
 
 		document.querySelector("#matchingPatterns textarea").value = AKS.matchingPatterns;
 		document.querySelector("#exclusionPatterns textarea").value = AKS.exclusionPatterns;
 
 		toggleModeSelectorState(AKS.mode);
 
-		// Set CONSTANT VIGILANCE! checkbox state.
-		document.querySelector("input#constant-vigilance").checked = AKS.constantVigilance == "true";
-
 		// De-activate the "Reset" and "Save" buttons.
 		setButtonsActive(false);
 
 		});
 	});
 
-	/*	Listener to activate Reset/Save buttons when the CONSTANT VIGILANCE
-		checkbox is toggled. */
-	document.querySelector("input#constant-vigilance").addEventListener("change", (event) => {
-		setButtonsActive(true);
-	});
-
 	// Listener for open help button.
 	document.querySelector(".open-help-button").addActivateEvent((event) => {
 		setHelpOverlayVisible(true);

src/platform/chrome/manifest.json

 {
 	"manifest_version":	2,
 	"name":				"AlwaysKillSticky",
-	"version":			"1.1.3",
+	"version":			"1.2",
 	"description":		"Get rid of sticky elements on websites - permanently!",
 	"author":			"Said Achmiz",
 	"homepage_url":		"https://git.sr.ht/~achmizs/AlwaysKillSticky.git",
 	},
 	"content_scripts":	[	{
 			"matches":			[ "http://*/*", "https://*/*" ],
-			"run_at":			"document_end",
+			"run_at":			"document_start",
 			"js":				[ "functions.js", "contentScript.js" ]
 		}
 	],

src/platform/firefox/manifest.json

 {
 	"manifest_version":				2,
 	"name":							"AlwaysKillSticky",
-	"version":						"1.1.3",
+	"version":						"1.2",
 	"description":					"Get rid of sticky elements on websites - permanently!",
 	"author":						"Said Achmiz",
 	"browser_specific_settings":	{
 	},
 	"content_scripts":				[	{
 			"matches":						[ "http://*/*", "https://*/*" ],
-			"run_at":						"document_end",
+			"run_at":						"document_start",
 			"js":							[ "functions.js", "contentScript.js" ]
 		}
 	],