reddit-trigger.es6.js

NodeList.prototype[Symbol.iterator] = [][Symbol.iterator];
const parseNode = node => {
	if (node.classList && node.classList.contains('user-container')) {
		for( let message of node.querySelectorAll('.content')) {
			let links = message.querySelectorAll('a');
			// replace reddit\.com with whatever domain you want to bitch about needlessly 
			let re = /^https?:\/\/([^\/]*\.)?reddit\.com(\/.*|$)/i;
			for( let link of links ) {
				if( re.test(link.href) ) link.textContent = '[WARNING!!! TRIGGER!!!]';
			}
		};
	}
};
for(let node of document.querySelectorAll('#chat .user-container')) parseNode(node);
new MutationObserver(records => records.forEach(record => [].forEach.call(record.addedNodes, parseNode))).observe(chat, {
	childList: true,
	subtree: true
});

reddit-trigger.js

'use strict';

NodeList.prototype[Symbol.iterator] = [][Symbol.iterator];
var parseNode = function parseNode(node) {
	if (node.classList && node.classList.contains('user-container')) {
		var _iteratorNormalCompletion = true;
		var _didIteratorError = false;
		var _iteratorError = undefined;

		try {
			for (var _iterator = node.querySelectorAll('.content')[Symbol.iterator](), _step; !(_iteratorNormalCompletion = (_step = _iterator.next()).done); _iteratorNormalCompletion = true) {
				var message = _step.value;

				var links = message.querySelectorAll('a');
				var re = /^https?:\/\/([^\/]*\.)?reddit\.com(\/.*|$)/i;
				var _iteratorNormalCompletion2 = true;
				var _didIteratorError2 = false;
				var _iteratorError2 = undefined;

				try {
					for (var _iterator2 = links[Symbol.iterator](), _step2; !(_iteratorNormalCompletion2 = (_step2 = _iterator2.next()).done); _iteratorNormalCompletion2 = true) {
						var link = _step2.value;

						if (re.test(link.href)) link.textContent = '[WARNING!!! TRIGGER!!!]';
					}
				} catch (err) {
					_didIteratorError2 = true;
					_iteratorError2 = err;
				} finally {
					try {
						if (!_iteratorNormalCompletion2 && _iterator2['return']) {
							_iterator2['return']();
						}
					} finally {
						if (_didIteratorError2) {
							throw _iteratorError2;
						}
					}
				}
			}
		} catch (err) {
			_didIteratorError = true;
			_iteratorError = err;
		} finally {
			try {
				if (!_iteratorNormalCompletion && _iterator['return']) {
					_iterator['return']();
				}
			} finally {
				if (_didIteratorError) {
					throw _iteratorError;
				}
			}
		}

		;
	}
};
var _iteratorNormalCompletion3 = true;
var _didIteratorError3 = false;
var _iteratorError3 = undefined;

try {
	for (var _iterator3 = document.querySelectorAll('#chat .user-container')[Symbol.iterator](), _step3; !(_iteratorNormalCompletion3 = (_step3 = _iterator3.next()).done); _iteratorNormalCompletion3 = true) {
		var node = _step3.value;
		parseNode(node);
	}
} catch (err) {
	_didIteratorError3 = true;
	_iteratorError3 = err;
} finally {
	try {
		if (!_iteratorNormalCompletion3 && _iterator3['return']) {
			_iterator3['return']();
		}
	} finally {
		if (_didIteratorError3) {
			throw _iteratorError3;
		}
	}
}

new MutationObserver(function (records) {
	return records.forEach(function (record) {
		return [].forEach.call(record.addedNodes, parseNode);
	});
}).observe(chat, {
	childList: true,
	subtree: true
});