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    <p>There are two hurdles to be taken before a Typekit font can be used in a Chrome extension:</p> <ol> <li>By default, Chrome prevents external scripts from being loaded in the extension's process.</li> <li>Chrome prevents inline scripts from being executed.</li> <li>Typekit will reply with 403 Forbidden, unless the correct Referer header is set.</li> </ol> <hr> <p>I uploaded the source code of a demo to <a href="https://robwu.nl/typekit-demo.zip">https://robwu.nl/typekit-demo.zip</a>. To see that the extension works, open the options page of the sample extension.</p> <hr> <p>For the next example, I have created a Typekit kit with the following settings:</p> <p><img src="https://i.stack.imgur.com/1FAE1.png" alt="https://typekit.com/kit_editor/kits/ekl0khv Name: Chrome extension demo Domains: hjdaoalallnjkokclafeljbcmpogfiig"></p> <p>To fix the first problem, edit your manifest file and relax the <a href="http://developer.chrome.com/extensions/contentSecurityPolicy.html">Content Security policy</a>:</p> <pre><code>"content_security_policy": "script-src 'self' https://use.typekit.net; object-src 'self'" </code></pre> <p>To solve the second issue, move the loader to an external file. Your extension page should look like this:</p> <pre class="lang-html prettyprint-override"><code> &lt;script src="https://use.typekit.net/ekl0khv.js"&gt;&lt;/script&gt; &lt;script src="load-typekit.js"&gt;&lt;/script&gt; </code></pre> <pre class="lang-js prettyprint-override"><code>// load-typekit.js try{Typekit.load();}catch(e){} </code></pre> <p>To solve the last issue, you need to modify the Referer header. This bit of code requires the <code>webRequest</code>, <code>webRequestBlocking</code> and <code>*://use.typekit.net/</code> permissions in the manifest file; <a href="https://developer.chrome.com/extensions/webRequest.html#event-onBeforeSendHeaders"><code>chrome.webRequest.onBeforeSendHeaders</code></a> is used to modify the headers.</p> <pre><code>// background.js chrome.webRequest.onBeforeSendHeaders.addListener(function(details) { var requestHeaders = details.requestHeaders; for (var i=0; i&lt;requestHeaders.length; ++i) { if (requestHeaders[i].name.toLowerCase() === 'referer') { // The request was certainly not initiated by a Chrome extension... return; } } // Set Referer requestHeaders.push({ name: 'referer', // Host must match the domain in your Typekit kit settings value: 'https://hjdaoalallnjkokclafeljbcmpogfiig/' }); return { requestHeaders: requestHeaders }; }, { urls: ['*://use.typekit.net/*'], types: ['stylesheet'] }, ['requestHeaders','blocking']); </code></pre> <h2>Minimal manifest.json</h2> <p>This is the minimal <a href="https://developer.chrome.com/extensions/manifest.html"><code>manifest.json</code></a> file for getting the extension to work. <code>background.js</code> is referenced in the previous section.</p> <pre><code>{ "name": "Name of extension", "version": "1", "manifest_version": 2, "background": { "scripts": ["background.js"] }, "permissions": [ "*://use.typekit.net/*", "webRequest", "webRequestBlocking" ], "content_security_policy": "script-src 'self' https://use.typekit.net; object-src 'self'" } </code></pre>
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    1. POGoogle Chrome Extensions with Typekit Fonts
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    1. POGoogle Chrome Extensions with Typekit Fonts
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    1. COGreat answer, thanks for the response. I haven't had time to test this out but I'll accept and upvote.
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    2. COThanks Rob will try this out
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    3. COThis is a good idea but it didn't work for me. I installed the zip in Chrome as an unpacked extension. When viewing the Options page I get the following JS error: Failed to load resource: the server responded with a status of 403 (Forbidden). Just to be sure, I also set up my own Typekit test with to be positive everything was published correctly.
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