Add Safari support

Fixes #10

index.ts

@@ -89,17 +89,27 @@ function updateItem({tabId}: {tabId: number}): void {
 }
 
 async function togglePermission(tab: chrome.tabs.Tab, toggle: boolean): Promise<void> {
+	// Don't use non-ASCII characters because Safari breaks the encoding in executeScript.code
+	const safariError = 'The browser didn\'t supply any information about the active tab.';
+	if (!tab.url && toggle) {
+		throw new Error(`Please try again. ${safariError}`);
+	}
+
+	if (!tab.url && !toggle) {
+		throw new Error(`Couldn't disable the extension on the current tab. ${safariError}`);
+	}
+
 	const permissionData = {
 		origins: [
 			new URL(tab.url!).origin + '/*'
 		]
 	};
 
 	if (!toggle) {
-		return p(chrome.permissions.remove, permissionData);
+		return p(chrome.permissions.remove.bind(chrome.permissions), permissionData);
 	}
 
-	const userAccepted = await p(chrome.permissions.request, permissionData);
+	const userAccepted = await p(chrome.permissions.request.bind(chrome.permissions), permissionData);
 	if (!userAccepted) {
 		chrome.contextMenus.update(contextMenuId, {
 			checked: false