Inject custom CSS into any website

Latest Version

Version
1.0.1
Update
November 30, 2024
Size
137KiB
Developer
Category
Users
3
Rating
0 ★
Manifest Version
3
Web Store Status
Languages Support
English (United States)
See more
Permissions
Storage
Scripting
ActiveTab
UnlimitedStorage
See more

CSS Inject Extension

An extension to inject custom CSS into any site you want and have it be saved. The CSS will persist across sessions and your preferences will be saved.

The best part of this extension is that it has minimal permissions, which reduces the risk of this being malware or being used in a trojan horse attack. Basically other extensions that need to inject javascript onto the page can also track your browsing history. This doesn't, because I only ask for permissions at runtime. This leads to a more secure experience if the only thing you want to do is inejct CSS.

The source code is at https://github.com/aadilmallick/css-injector

**Current features**

- Persistent injected custom CSS
- Remove annoying toasts with an option in the options page
- Unlimited storage
- Code styling

**Future features**

- Add options for matches on URLs instead of just domain name
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Source Manifest.json

{"update_url": "https://clients2.google.com/service/update2/crx", "name": "CSS Inject", "description": "Inject custom CSS into any website", "version": "1.0.1", "manifest_version": 3, "icons": { "16": "icon.png", "48": "icon.png", "128": "icon.png" }, "action": { "default_popup": "popup.html", "default_title": "Inject CSS", "default_icon": "icon.png" }, "permissions": ["storage", "scripting", "activeTab", "unlimitedStorage"], "optional_host_permissions": [""], "options_page": "options.html", "background": { "service_worker": "background.js", "type": "module" }}
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How to download and manually install CSS Inject extension for Chrome

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

Method 1: Download CSS Inject extension and manually install through Drag &Drop

If you ever need to manually install a CSS Inject 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 CSS Inject Extension by clicking the "Download CRX" button on the website.

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

This is another method to install CSS Inject 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 CSS Inject extension file

Select and download the CSS Inject 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 CSS Inject 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 CSS Inject 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 CSS Inject 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 CSS Inject extension in 2 ways. We hope this guide proves helpful.

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