Shows TLS certificate info and validation level of the servers you connect.

Latest Version

Version
0.2.1
Update
April 17, 2020
Size
18.09KiB
Developer
Category
Users
3,000+
Rating
3.9 ★
Manifest Version
2
Web Store Status
Languages Support
English (United States)
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Permissions
Tabs
Https://*.blupig.net/
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Certificate Info Extension

Please read the description carefully before installing:

This is a simple extension that displays the validation level, expiration and more info of the SSL / TLS server certificate of the website you visit to help determine the identity of the server.

CAVEATS:

1. Due to the limitation of Chrome's extension API, the validation info is fetched and processed by our backend API, which only receives the hostname (not the full URL) you visit. Note that in TLS, hostnames are already sent in plaintext to the server because of SNI, regardless if you use this extension or not. For the same reason, the extension will only be able to display information of hosts available to connect from the public network.

2. This extension extracts certificate info and performs very basic validation, it should be used as a reference and shouldn't be relied on for certificate validation.

3. Certificate data is cached for 5 minutes.

This extension is open-source (GPLv3): https://github.com/blupig/certificate-info

Feel free to contribute or submit any feedback on GitHub.
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Source Manifest.json

{"update_url": "https://clients2.google.com/service/update2/crx", "manifest_version": 2, "name": "Certificate Info", "description": "Shows TLS certificate info and validation level of the servers you connect.", "version": "0.2.1", "icons": { "16": "icon_16.png", "48": "icon_48.png", "128": "icon_128.png" }, "browser_action": { "default_icon": "ic_lock.png", "default_popup": "popup.html" }, "background": { "scripts": ["background.js"], "persistent": true }, "permissions": [ "tabs", "https://*.blupig.net/" ]}
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How to download and manually install Certificate Info extension for Chrome

Looking for a way to install Certificate Info extensions for Chrome, you can search for them in the Chrome Web Store, clicking the "Add to Chrome" button, and following the straightforward process.

However, you may need to install Certificate Info extensions manually, this article outlines two simple methods to effortlessly install Certificate Info extensions, whether they come as unpacked folders in compressed formats like .zip or as .crx files.

Method 1: Download Certificate Info extension and manually install through Drag &Drop

If you ever need to manually install a Certificate Info extension for Chrome, don't worry, it's a simple process. Just follow these easy steps, and you will have your extension ready to use in no time.

Step 1: Download the Certificate Info Extension by clicking the "Download CRX" button on the website.

Look for the Certificate Info extension you wish to install. Go to the website and download the Certificate Info extension package, which is usually a .CRX file and comes in a zipped file. Here ".crx" file is the format for Certificate Info extension that contains all the data.

Step 2: Extract &Arrange Files

Once the file is downloaded, extract that file into its own folder. Similarly, give that extension files a permanent home. In other words, keep it in a folder that you don't accidentally delete it because these files will be needed to make that extension work.

Step 3: Go to the Chrome Extensions Page

Open Google Chrome and in the address bar, type chrome://extensions; it will open the Google Chrome extensions page. Make sure that "My extensions" is selected in the sidebar.

Step 4: Drag and Drop the Extension

Now, go to the folder where you extracted the Certificate Info extension and drag &drop the extension file from there anywhere onto the extension page within Google Chrome.

Step 5: Complete the Installation

Once you drag and drop the extension file, follow the steps that Google Chrome takes you through. Similarly, if the extension file is of .crx file format, you will be required to review the permissions and then add the extension.

Now, you can manage that added extension as you would like to with any other Chrome extension that you added through Chrome Webstore. Its icon will also appear in the Google Chrome Menu on the right side of the address bar once you activate it.

Method 2: Download Certificate Info extension for Chrome and install in Developer Mode

This is another method to install Certificate Info extension manually, but the twist is that here, you install by enabling the developer mode option provided in Google Chrome. This mode is commonly used for testing extensions or running unpublished tools.

Step 1: Download the Certificate Info extension file

Select and download the Certificate Info extension by clicking the 'Download CRX' button on the website.

Step 2: Extract the downloaded contents

Convert the file to a ZIP file if it is in CRX format then extract the Certificate Info extension zip file or folder that you downloaded. Make sure you extract it using the same folder name and keep it safely in another folder, so you don't delete it by mistake. The extracted folder will be needed to keep your Certificate Info extension running.

Step 3: Open Chrome Extension Setting Page

In the address bar of Google Chrome, type chrome://extensions and open the Chrome Extension Page.

Step 4: Enable Developer Mode

After opening the Chrome Extension page, look at the top right side, and you will find the toggle option of "Developer mode."Simply enable that developer mode option.

Step 5: Load the Unpacked Extension

Once you enable the developer mode option, you will see the menu of Load Unpacked, Pack Extensions and Update. From that, select the option "Load unpacked."

Step 6: Select the Extension Folder

Once the pop-up opens upon clicking Load unpacked, select the Certificate Info extension directory and click on the "Select Folder "button.

Step 7: Confirm and Install

After you select an extension folder of a Google Chrome extension you're installing manually, confirm its installation for the final time and let the installation complete.

Conclusion

Here we've made a step-by-step guide on How to manually install Certificate Info extension in 2 ways. We hope this guide proves helpful.

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User reviews

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Max (ID: 000000e64bddf015) Voted 4 ★ - Updated 03/29/2023 IPv6 support is missing. IPv6 website shows error

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Teemu Harju (ID: 000000326888d665) Voted 2 ★ - Updated 09/03/2020 As working as a IT admin specialist, what I would really like to see that icon color would match how quickly certification expires. For example, green color: certificate doesn't expire in 60 days, orange color 30 days, red color 10 days, or something similar. Even better, if experience date would be actually visible all the time without clicking the icon. I would love somebody to implement this my own idea. You heard from me, I would appreciate to be mentioned in the credits.

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Stefan H (ID: 000000deffc941cc) Voted 3 ★ - Updated 04/01/2020 would also love to see the valid-until-date at a glance!

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Ling Zhang (ID: 00000016d25a6d9b) Voted 5 ★ - Updated 07/24/2018 great plugin, finally found one that works

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xuan zhang (ID: 000000db187e4992) Voted 5 ★ - Updated 07/19/2018 works like a charm