diff --git a/readme.md b/readme.md
index d89e67e98b15..806ab8d8fdda 100644
--- a/readme.md
+++ b/readme.md
@@ -44,6 +44,7 @@ GitHub Enterprise is also supported by [authorizing your own domain in the optio
 - [Adds search filter for 'Everything commented by you'](https://cloud.githubusercontent.com/assets/940070/25518367/cb917d3e-2c36-11e7-8475-c4e6dbe0ed6c.png)
 - [Moves destructive buttons ("Close issue", "Cancel") in commenting forms away from primary button](#comment-box)
 - [Adds `Yours` button to Issues/Pull Requests page](https://cloud.githubusercontent.com/assets/1282980/14636384/0d8770e4-0623-11e6-8520-2054bece2771.png)
+- [Condenses long URLs into references like _user/repo/.file@`d71718d`_](https://user-images.githubusercontent.com/1402241/27252232-8fdf8ed0-538b-11e7-8f19-12d317c9cd32.png)
 - Easier copy-pasting from diffs by making +/- signs unselectable
 - Shows the reactions popover on hover instead of click
 - Supports indenting with the tab key in textareas like the comment box (<kbd>Shift</kbd> <kbd>Tab</kbd> for original behavior)
diff --git a/src/content.js b/src/content.js
index f086f82370aa..909fefdd1cbf 100644
--- a/src/content.js
+++ b/src/content.js
@@ -16,6 +16,7 @@ import showRealNames from './libs/show-names';
 import filePathCopyBtnListner from './libs/copy-file-path';
 import addFileCopyButton from './libs/copy-file';
 import linkifyCode, {editTextNodes} from './libs/linkify-urls-in-code';
+import shortenLinks from './libs/shorten-links';
 import * as icons from './libs/icons';
 import * as pageDetect from './libs/page-detect';
 
@@ -552,6 +553,7 @@ function init() {
 			addCompareTab();
 			removeProjectsTab();
 			addTitleToEmojis();
+			shortenLinks();
 
 			diffFileHeader.destroy();
 			enableCopyOnY.destroy();
diff --git a/src/libs/shorten-links.js b/src/libs/shorten-links.js
new file mode 100644
index 000000000000..2cb278664b27
--- /dev/null
+++ b/src/libs/shorten-links.js
@@ -0,0 +1,178 @@
+import select from 'select-dom';
+import {getRepoURL} from './page-detect';
+
+const patchDiffRegex = /[.](patch|diff)$/;
+const releaseRegex = /releases[/]tag[/]([^/]+)/;
+const labelRegex = /labels[/]([^/]+)/;
+const releaseArchiveRegex = /archive[/](.+)([.]zip|[.]tar[.]gz)/;
+const releaseDownloadRegex = /releases[/]download[/]([^/]+)[/](.+)/;
+
+const reservedPaths = [
+	'join',
+	'site',
+	'blog',
+	'about',
+	'login',
+	'pulls',
+	'search',
+	'issues',
+	'explore',
+	'contact',
+	'pricing',
+	'trending',
+	'settings',
+	'features',
+	'business',
+	'personal',
+	'security',
+	'dashboard',
+	'showcases',
+	'open-source',
+	'marketplace'
+];
+
+const styleRevision = revision => {
+	if (!revision) {
+		return;
+	}
+	revision = revision.replace(patchDiffRegex, '');
+	if (/^[0-9a-f]{40}$/.test(revision)) {
+		revision = revision.substr(0, 7);
+	}
+	return `<code>${revision}</code>`;
+};
+
+// Filter out null values
+const joinValues = (array, delimiter = '/') => {
+	return array.filter(s => s).join(delimiter);
+};
+
+export function shortenUrl(href) {
+	/**
+	 * Parse URL
+	 */
+	const {
+		origin,
+		pathname,
+		search,
+		hash
+	} = new URL(href);
+
+	const isRaw = [
+		'https://raw.githubusercontent.com',
+		'https://cdn.rawgit.com',
+		'https://rawgit.com'
+	].includes(origin);
+
+	let [
+		user,
+		repo,
+		type,
+		revision,
+		...filePath
+	] = pathname.substr(1).split('/');
+
+	if (isRaw) {
+		[
+			user,
+			repo,
+			// Raw URLs don't have `blob` here
+			revision,
+			...filePath
+		] = pathname.substr(1).split('/');
+		type = 'raw';
+	}
+
+	revision = styleRevision(revision);
+	filePath = filePath.join('/');
+
+	const isLocal = origin === location.origin;
+	const isThisRepo = (isLocal || isRaw) && getRepoURL() === `${user}/${repo}`;
+	const isReserved = reservedPaths.includes(user);
+	const [, diffOrPatch] = pathname.match(patchDiffRegex) || [];
+	const [, release] = pathname.match(releaseRegex) || [];
+	const [, releaseTag, releaseTagExt] = pathname.match(releaseArchiveRegex) || [];
+	const [, downloadTag, downloadFilename] = pathname.match(releaseDownloadRegex) || [];
+	const [, label] = pathname.match(labelRegex) || [];
+	const isFileOrDir = revision && [
+		'raw',
+		'tree',
+		'blob',
+		'blame',
+		'commits'
+	].includes(type);
+
+	const repoUrl = isThisRepo ? '' : `${user}/${repo}`;
+
+	/**
+	 * Shorten URL
+	 */
+
+	if (isReserved || (!isLocal && !isRaw)) {
+		return href
+		.replace(/^https:[/][/]/, '')
+		.replace(/^www[.]/, '')
+		.replace(/[/]$/, '');
+	}
+
+	if (user && !repo) {
+		return `@${user}${search}${hash}`;
+	}
+
+	if (isFileOrDir) {
+		const file = `${repoUrl}${filePath ? '/' + filePath : ''}`;
+		const revisioned = joinValues([file, revision], '@');
+		const partial = `${revisioned}${search}${hash}`;
+		if (type !== 'blob' && type !== 'tree') {
+			return `${partial} (${type})`;
+		}
+		return partial;
+	}
+
+	if (diffOrPatch) {
+		const partial = joinValues([repoUrl, revision], '@');
+		return `${partial}.${diffOrPatch}${search}${hash}`;
+	}
+
+	if (release) {
+		const partial = joinValues([repoUrl, `<code>${release}</code>`], '@');
+		return `${partial}${search}${hash} (release)`;
+	}
+
+	if (releaseTagExt) {
+		const partial = joinValues([repoUrl, `<code>${releaseTag}</code>`], '@');
+		return `${partial}${releaseTagExt}${search}${hash}`;
+	}
+
+	if (downloadFilename) {
+		const partial = joinValues([repoUrl, `<code>${downloadTag}</code>`], '@');
+		return `${partial} ${downloadFilename}${search}${hash} (download)`;
+	}
+
+	if (label) {
+		return joinValues([repoUrl, label]) + `${search}${hash} (label)`;
+	}
+
+	// Drop leading and trailing slash of relative path
+	return `${pathname.replace(/^[/]|[/]$/g, '')}${search}${hash}`;
+}
+
+export default () => {
+	for (const a of select.all('a[href]')) {
+		// Don't change if it was already customized
+		// .href automatically adds a / to naked origins
+		// so that needs to be tested too
+		if (a.href !== a.textContent && a.href !== `${a.textContent}/`) {
+			continue;
+		}
+
+		const shortened = shortenUrl(a.href);
+
+		// Don't touch the dom if there's nothing to change
+		if (shortened === a.textContent) {
+			continue;
+		}
+
+		a.innerHTML = shortened;
+	}
+};
diff --git a/test/fixtures/window.js b/test/fixtures/window.js
index c7e0cfb2b16a..5d9c9de1f0cd 100644
--- a/test/fixtures/window.js
+++ b/test/fixtures/window.js
@@ -1,20 +1,7 @@
-const url = require('url');
+const URL = require('url').URL;
 
-function WindowMock(initialURI) {
-	this._currentURI = initialURI;
+function WindowMock(initialURI = 'https://github.com') {
+	this.location = new URL(initialURI);
 }
 
-WindowMock.prototype.location = {
-	set href(uri) {
-		const uriParts = url.parse(uri);
-		this.hostname = uriParts.hostname;
-		this.pathname = uriParts.pathname;
-		this._currentURI = uri;
-	},
-
-	get href() {
-		return this._currentURI;
-	}
-};
-
 module.exports = WindowMock;
diff --git a/test/shorten-links.js b/test/shorten-links.js
new file mode 100644
index 000000000000..13617c48264c
--- /dev/null
+++ b/test/shorten-links.js
@@ -0,0 +1,357 @@
+import {URL} from 'url';
+import test from 'ava';
+import {shortenUrl} from '../src/libs/shorten-links';
+import Window from './fixtures/window';
+
+global.URL = URL;
+global.window = new Window('https://github.com/sindresorhus/refined-github/pull/473');
+global.location = window.location;
+
+function urlMatcherMacro(t, shouldMatch = []) {
+	for (const [originalUrl, expectedShortenedUrl] of shouldMatch) {
+		t.is(shortenUrl(originalUrl), expectedShortenedUrl);
+	}
+}
+
+test('shortenUrl', urlMatcherMacro, new Map([
+	[
+		'https://github.com/sindresorhus/refined-github/',
+		'sindresorhus/refined-github'
+	],
+	[
+		'https://github.com/sindresorhus/refined-github/tree/v0.12',
+		'<code>v0.12</code>'
+	],
+	[
+		'https://github.com/sindresorhus/refined-github/tree/d71718db6aa4feb8dc10edbad1134472468e971a',
+		'<code>d71718d</code>'
+	],
+	[
+		'https://github.com/nodejs/node/',
+		'nodejs/node'
+	],
+	[
+		'https://github.com/nodejs/node/tree/v0.12',
+		'nodejs/node@<code>v0.12</code>'
+	],
+	[
+		'https://github.com/nodejs/node/tree/d71718db6aa4feb8dc10edbad1134472468e971a',
+		'nodejs/node@<code>d71718d</code>'
+	],
+	[
+		'https://github.com/sindresorhus/refined-github/tree/master/doc',
+		'/doc@<code>master</code>'
+	],
+	[
+		'https://github.com/sindresorhus/refined-github/tree/v0.12/doc',
+		'/doc@<code>v0.12</code>'
+	],
+	[
+		'https://github.com/sindresorhus/refined-github/tree/d71718db6aa4feb8dc10edbad1134472468e971a/doc',
+		'/doc@<code>d71718d</code>'
+	],
+	[
+		'https://github.com/nodejs/node/tree/master/doc',
+		'nodejs/node/doc@<code>master</code>'
+	],
+	[
+		'https://github.com/nodejs/node/tree/v0.12/doc',
+		'nodejs/node/doc@<code>v0.12</code>'
+	],
+	[
+		'https://github.com/nodejs/node/tree/d71718db6aa4feb8dc10edbad1134472468e971a/doc',
+		'nodejs/node/doc@<code>d71718d</code>'
+	],
+	[
+		'https://github.com/sindresorhus/refined-github/blob/master/.gitignore',
+		'/.gitignore@<code>master</code>'
+	],
+	[
+		'https://github.com/sindresorhus/refined-github/blob/v0.12/.gitignore',
+		'/.gitignore@<code>v0.12</code>'
+	],
+	[
+		'https://github.com/sindresorhus/refined-github/blob/cc8fc46/.gitignore',
+		'/.gitignore@<code>cc8fc46</code>'
+	],
+	[
+		'https://github.com/nodejs/node/blob/master/.gitignore',
+		'nodejs/node/.gitignore@<code>master</code>'
+	],
+	[
+		'https://github.com/nodejs/node/blob/v0.12/.gitignore',
+		'nodejs/node/.gitignore@<code>v0.12</code>'
+	],
+	[
+		'https://github.com/nodejs/node/blob/cc8fc46/.gitignore',
+		'nodejs/node/.gitignore@<code>cc8fc46</code>'
+	],
+	[
+		'https://github.com/sindresorhus/refined-github/blame/master/.gitignore',
+		'/.gitignore@<code>master</code> (blame)'
+	],
+	[
+		'https://github.com/sindresorhus/refined-github/blame/v0.12/.gitignore',
+		'/.gitignore@<code>v0.12</code> (blame)'
+	],
+	[
+		'https://github.com/sindresorhus/refined-github/blame/cc8fc46/.gitignore',
+		'/.gitignore@<code>cc8fc46</code> (blame)'
+	],
+	[
+		'https://github.com/nodejs/node/blame/master/.gitignore',
+		'nodejs/node/.gitignore@<code>master</code> (blame)'
+	],
+	[
+		'https://github.com/nodejs/node/blame/v0.12/.gitignore',
+		'nodejs/node/.gitignore@<code>v0.12</code> (blame)'
+	],
+	[
+		'https://github.com/nodejs/node/blame/cc8fc46/.gitignore',
+		'nodejs/node/.gitignore@<code>cc8fc46</code> (blame)'
+	],
+	[
+		'https://github.com/sindresorhus/refined-github/commits/master/.gitignore',
+		'/.gitignore@<code>master</code> (commits)'
+	],
+	[
+		'https://github.com/sindresorhus/refined-github/commits/v0.12/.gitignore',
+		'/.gitignore@<code>v0.12</code> (commits)'
+	],
+	[
+		'https://github.com/sindresorhus/refined-github/commits/cc8fc46/.gitignore',
+		'/.gitignore@<code>cc8fc46</code> (commits)'
+	],
+	[
+		'https://github.com/nodejs/node/commits/master/.gitignore',
+		'nodejs/node/.gitignore@<code>master</code> (commits)'
+	],
+	[
+		'https://github.com/nodejs/node/commits/v0.12/.gitignore',
+		'nodejs/node/.gitignore@<code>v0.12</code> (commits)'
+	],
+	[
+		'https://github.com/nodejs/node/commits/cc8fc46/.gitignore',
+		'nodejs/node/.gitignore@<code>cc8fc46</code> (commits)'
+	],
+	[
+		'https://github.com/sindresorhus/refined-github/commit/cc8fc46.diff',
+		'<code>cc8fc46</code>.diff'
+	],
+	[
+		'https://github.com/sindresorhus/refined-github/commit/cc8fc46.patch',
+		'<code>cc8fc46</code>.patch'
+	],
+	[
+		'https://github.com/nodejs/node/commit/cc8fc46.diff',
+		'nodejs/node@<code>cc8fc46</code>.diff'
+	],
+	[
+		'https://github.com/nodejs/node/commit/cc8fc46.patch',
+		'nodejs/node@<code>cc8fc46</code>.patch'
+	],
+	[
+		'https://github.com/sindresorhus/refined-github/releases/tag/v0.12.0',
+		'<code>v0.12.0</code> (release)'
+	],
+	[
+		'https://github.com/nodejs/node/releases/tag/v0.12.0',
+		'nodejs/node@<code>v0.12.0</code> (release)'
+	],
+	[
+		'https://github.com/sindresorhus/refined-github/milestone/25',
+		'sindresorhus/refined-github/milestone/25'
+	],
+	[
+		'https://github.com/nodejs/node/milestone/25',
+		'nodejs/node/milestone/25'
+	],
+	[
+		'https://github.com/sindresorhus/refined-github/labels/npm',
+		'npm (label)'
+	],
+	[
+		'https://github.com/nodejs/node/labels/npm',
+		'nodejs/node/npm (label)'
+	],
+	[
+		'https://github.com/sindresorhus/refined-github/archive/6.4.1.zip',
+		'<code>6.4.1</code>.zip'
+	],
+	[
+		'https://github.com/sindresorhus/refined-github/releases/download/6.4.1/now-macos',
+		'<code>6.4.1</code> now-macos (download)'
+	],
+	[
+		'https://github.com/zeit/now-cli/archive/6.4.1.zip',
+		'zeit/now-cli@<code>6.4.1</code>.zip'
+	],
+	[
+		'https://github.com/zeit/now-cli/releases/download/6.4.1/now-macos',
+		'zeit/now-cli@<code>6.4.1</code> now-macos (download)'
+	],
+	[
+		'https://github.com/sindresorhus/refined-github/wiki',
+		'sindresorhus/refined-github/wiki'
+	],
+	[
+		'https://github.com/sindresorhus/refined-github/pulse',
+		'sindresorhus/refined-github/pulse'
+	],
+	[
+		'https://github.com/sindresorhus/refined-github/labels',
+		'sindresorhus/refined-github/labels'
+	],
+	[
+		'https://github.com/sindresorhus/refined-github/network',
+		'sindresorhus/refined-github/network'
+	],
+	[
+		'https://github.com/sindresorhus/refined-github/projects',
+		'sindresorhus/refined-github/projects'
+	],
+	[
+		'https://github.com/sindresorhus/refined-github/releases',
+		'sindresorhus/refined-github/releases'
+	],
+	[
+		'https://github.com/sindresorhus/refined-github/milestones',
+		'sindresorhus/refined-github/milestones'
+	],
+	[
+		'https://github.com/sindresorhus/refined-github/contributors',
+		'sindresorhus/refined-github/contributors'
+	],
+	[
+		'https://github.com/nodejs/node/wiki',
+		'nodejs/node/wiki'
+	],
+	[
+		'https://github.com/nodejs/node/pulse',
+		'nodejs/node/pulse'
+	],
+	[
+		'https://github.com/nodejs/node/labels',
+		'nodejs/node/labels'
+	],
+	[
+		'https://github.com/nodejs/node/network',
+		'nodejs/node/network'
+	],
+	[
+		'https://github.com/nodejs/node/projects',
+		'nodejs/node/projects'
+	],
+	[
+		'https://github.com/nodejs/node/releases',
+		'nodejs/node/releases'
+	],
+	[
+		'https://github.com/nodejs/node/milestones',
+		'nodejs/node/milestones'
+	],
+	[
+		'https://github.com/nodejs/node/contributors',
+		'nodejs/node/contributors'
+	],
+	[
+		'https://github.com/nodejs/node/graphs/commit-activity',
+		'nodejs/node/graphs/commit-activity'
+	],
+	[
+		'https://rawgit.com/sindresorhus/refined-github/master/.gitignore',
+		'/.gitignore@<code>master</code> (raw)'
+	],
+	[
+		'https://cdn.rawgit.com/sindresorhus/refined-github/v0.12/.gitignore',
+		'/.gitignore@<code>v0.12</code> (raw)'
+	],
+	[
+		'https://cdn.rawgit.com/sindresorhus/refined-github/d71718db/.gitignore',
+		'/.gitignore@<code>d71718db</code> (raw)'
+	],
+	[
+		'https://raw.githubusercontent.com/sindresorhus/refined-github/master/.gitignore',
+		'/.gitignore@<code>master</code> (raw)'
+	],
+	[
+		'https://raw.githubusercontent.com/sindresorhus/refined-github/v0.12/.gitignore',
+		'/.gitignore@<code>v0.12</code> (raw)'
+	],
+	[
+		'https://raw.githubusercontent.com/sindresorhus/refined-github/d71718db/.gitignore',
+		'/.gitignore@<code>d71718db</code> (raw)'
+	],
+	[
+		'https://rawgit.com/nodejs/node/master/.gitignore',
+		'nodejs/node/.gitignore@<code>master</code> (raw)'
+	],
+	[
+		'https://cdn.rawgit.com/nodejs/node/v0.12/.gitignore',
+		'nodejs/node/.gitignore@<code>v0.12</code> (raw)'
+	],
+	[
+		'https://cdn.rawgit.com/nodejs/node/d71718db/.gitignore',
+		'nodejs/node/.gitignore@<code>d71718db</code> (raw)'
+	],
+	[
+		'https://raw.githubusercontent.com/nodejs/node/master/.gitignore',
+		'nodejs/node/.gitignore@<code>master</code> (raw)'
+	],
+	[
+		'https://raw.githubusercontent.com/nodejs/node/v0.12/.gitignore',
+		'nodejs/node/.gitignore@<code>v0.12</code> (raw)'
+	],
+	[
+		'https://raw.githubusercontent.com/nodejs/node/d71718db/.gitignore',
+		'nodejs/node/.gitignore@<code>d71718db</code> (raw)'
+	],
+	[
+		'https://github.com/sindresorhus',
+		'@sindresorhus'
+	],
+	[
+		'https://github.com/nodejs',
+		'@nodejs'
+	],
+	[
+		'https://github.com/pulls',
+		'github.com/pulls'
+	],
+	[
+		'https://github.com/issues',
+		'github.com/issues'
+	],
+	[
+		'https://github.com/trending',
+		'github.com/trending'
+	],
+	[
+		'https://github.com/features',
+		'github.com/features'
+	],
+	[
+		'https://github.com/marketplace',
+		'github.com/marketplace'
+	],
+	[
+		'https://github.com/trending/developers',
+		'github.com/trending/developers'
+	],
+	[
+		'https://github.com/settings/profile',
+		'github.com/settings/profile'
+	],
+	[
+		'https://www.npmjs.com/',
+		'npmjs.com'
+	],
+	[
+		'https://www.npmjs.com/package/node',
+		'npmjs.com/package/node'
+	],
+	[
+		'https://example.com/nodejs/node/blob/cc8fc46/.gitignore',
+		'example.com/nodejs/node/blob/cc8fc46/.gitignore'
+	]
+]));