Added link to standalone options page.

As mentioned in #221.

_locales/de/messages.json

@@ -43,6 +43,10 @@
 		"message": "CanvasBlocker wurde aktualisiert. Wenn Sie diese Seite in Zukunft erreichen wollen und noch kein Lesezeichen erstellt haben, erstellen Sie bitte eines.",
 		"description": ""
 	},
+	"openInTab": {
+		"message": "In separatem Tab öffnen",
+		"description": ""
+	},
 	
 	"section_asking": {
 		"message": "Nachfragen",

_locales/en/messages.json

@@ -43,6 +43,10 @@
 		"message": "CanvasBlocker was updated. If you want to be able to access this page in the future and have not bookmarked it, please bookmark it.",
 		"description": ""
 	},
+	"openInTab": {
+		"message": "Open in separate tab",
+		"description": ""
+	},
 	
 	"section_asking": {
 		"message": "Asking",

options/options.css

@@ -188,6 +188,17 @@ td.hideColumn {
 	background-image: url(notVisible.svg);
 }
 
+.optionsLink {
+	text-align: right;
+	font-size: 0.8em;
+}
+.optionsLink a {
+	text-decoration: none;
+}
+.optionsLink a:hover {
+	text-decoration: underline;
+}
+
 .version {
 	text-align: right;
 	color: gray;

options/options.js

@@ -71,6 +71,16 @@
 			
 			document.body.classList.add("standalone");
 		}
+		else {
+			const linkDiv = document.createElement("div");
+			linkDiv.className = "optionsLink";
+			const link = document.createElement("a");
+			link.href = window.location.href;
+			link.target = "_blank";
+			link.textContent = browser.i18n.getMessage("openInTab");
+			linkDiv.appendChild(link);
+			head.appendChild(linkDiv);
+		}
 	});
 	
 	var table = document.createElement("table");

releaseNotes.txt

@@ -4,6 +4,7 @@ Version 0.5.3:
 	
 	new features:
 		- display version in options page
+		- added link to open options page in separate tab
 	
 	fixes:
 		- CSP did not work properly for worker-src