A Chrome browser extension that estimates the HTTP compression level of the page.

Latest Version

Version
0.0.1
Update
March 17, 2022
Size
520KiB
Developer
Category
Users
98
Rating
1 ★
Manifest Version
3
Web Store Status
Languages Support
English
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Permissions
WebRequest
WebNavigation
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Estimate compression level Extension

Background

Compression is a core feature of HTTP that improves transfer speed, cache bandwidth utilization and cache utilization.

Lossless data compression algorithms development led to the LZW algorithm (1984), used by the compress application (1985), and then the PKZIP application (1991) with its DEFLATE algorithm which was then used in the gzip format (1992). The zlib library (1995) became a de facto standard compression library for gzip data.

HTTP/1.1 in 1999 (RFC 2616) added support for gzip, compress and deflate compression as content encodings. gzip compression quickly became the default as it compressed better than compress, which used the patented LZW algorithm, and as Microsoft incorrectly implemented deflate as a broken raw deflate stream instead of the correct deflate stream inside a zlib format wrapper.

Compression algorithms generally define a file format and how to decompress it. This allows the user to pick an appropriate compression level: either fast compression, which compresses quickly, but doesn't compress very small or instead best compression, which compresses slowly but generates a smaller output.

With gzip and zlib these levels range from 1 (fast) to 9 (best), with a default of 6.

When you browse to a page with this extension and the content is compressed with gzip, a little badge is shown with the estimated compression level.

If the compression was achieved with a gzip compressor other than zlib, a fractional estimate of zlib compression level is shown.

How does it work?

The chrome extension notes the Content-Length of the page as it is loaded, then fetches the page again, tries to compress it with a variety of levels and then displays the result.

This uses more network and CPU. Use sparingly.

TODO

Some websites use the newer Brotli compression algorithm instead of gzip. This extension does not support Brotli yet.
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Source Manifest.json

{"update_url": "https://clients2.google.com/service/update2/crx", "manifest_version": 3, "name": "Estimate compression level", "version": "0.0.1", "action": { "default_icon": { "128": "images/128.png" } }, "description": "A Chrome browser extension that estimates the HTTP compression level of the page.", "icons": { "128": "images/128.png" }, "background": { "service_worker": "background.js", "type": "module" }, "host_permissions": ["http://*/*", "https://*/*"], "permissions": ["webRequest", "webNavigation"]}
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How to download and manually install Estimate compression level extension for Chrome

Looking for a way to install Estimate compression level 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 Estimate compression level extensions manually, this article outlines two simple methods to effortlessly install Estimate compression level extensions, whether they come as unpacked folders in compressed formats like .zip or as .crx files.

Method 1: Download Estimate compression level extension and manually install through Drag &Drop

If you ever need to manually install a Estimate compression level 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 Estimate compression level Extension by clicking the "Download CRX" button on the website.

Look for the Estimate compression level extension you wish to install. Go to the website and download the Estimate compression level extension package, which is usually a .CRX file and comes in a zipped file. Here ".crx" file is the format for Estimate compression level 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 Estimate compression level 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 Estimate compression level extension for Chrome and install in Developer Mode

This is another method to install Estimate compression level 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 Estimate compression level extension file

Select and download the Estimate compression level 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 Estimate compression level 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 Estimate compression level 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 Estimate compression level 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 Estimate compression level extension in 2 ways. We hope this guide proves helpful.

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