SYBU JavaScript Blocker – Google Chrome Extension
SYBU JavaScript Blocker is a Google Chrome Extension to quickly block JavaScript (JS) files from being loaded by the browser
September 2023. We have remove the plugin from the Chrome Store, and is no longer available. The page is kept for historic record.
Setup
After you have installed the extension. Pin the icon to toolbar.
After you have installed the extension. It will be visible to the right of the Chrome search/address bar. It is a little blue shield icon. Click the icon.
The Sybu JavaScript Blocker has 3 modes: OFF | My Rules | Block All
Mode: OFF
After you have installed the extension. It will be visible to the right of the Chrome search/address bar. It is a little blue shield icon. Click the icon.
Mode: My Rules
After you have installed the extension. It will be visible to the right of the Chrome search/address bar. It is a little blue shield icon. Click the icon.
Block Rules
The extension will then block files containing the specified text.
Block 3rd Party scripts
When enabled (recommended), the script will block JavaScript files that are not from the same domain as the requested page.
This will immediately block a lot of trackers and advertising links, without the need to specify individually.
In the example below you will notice when this option is enabled any script not from the sybu.co.za domain was blocked.
Additional block rules can manually be entered. These can be complete URLs, or any part of, as shown
Add to My Rules
Rules can also be added by clicking on the indicator [+]
In this example if you choose:
analytics – This will block any JavaScript on any page that contains gpt as part of the URL
analytics.js – This will block the JavaScript with filename gpt.js on any page
https://www.google-analytics.com/analytics.js – This will block JavaScript file originating from 3 https://www.google-analytics.com/analytics.js
www.google-analytics.com – This will block any JavaScript originating from domain www.google-analytics.com
Other. This will block any JavaScript on any page that contains the specified text as part of the URL
Unblock file / Remove rule
To unblock a file (remove the block rule) click on the [-] button next to the file being blocked.
or simply remove the text from list of items in Block Rules
Rule Options
The setup of Allow Rules is similar to Block Rules. Simply add a list of items (full URLs, or partial names).
NOTE: An Allow Rule will override a Block Rule
Click Good/Bad Sites to add or remove domain that will always be blocked or always be allowed.
When it is required that no rules are applied that a website request, the website domain can be added. This may be useful for specific sites like Gmail for Facebook, to function properly. The domain for the current web request is already displayed, and you can simply click the Add Good or Add Bad button as seen in the example. Simple click the button, it will add it, save the setting and reload the page automatically. Alternately you can also manually add / remove domains in the space provided.
Click the Temporary Rules button to view rules that are temporary and will expire.
In some cases when you are visiting website you may not want to set a permanent rule. This is useful for sites that are not frequently visited.
Rules expire under following conditions.
After specific duration, the default is 1hr, but can be changed in the options of the extension.
After specific number of requests, the default is 10, but can be changed in the options of the extension.
When the browser is closed
Specific temporary allow rules can also set for individual scripts
Allow rules for temporary allow sites and scripts can be viewed or cleared
Mode: Block All
In this mode all JavaScript will be blocked, but you will find that most pages do not render properly. So options are available to allow some JavaScript to be loaded. Exceptions can be added in Allow Rules.
So for example it may be useful not to block a script like jquery since this is used on many websites to display content dynamically. An example is shown below where jquery is not blocked.
Options Menu
Import Rules (Replace): An exported file can be imported. This will replace all existing rules. The filename must start with SybuJsBlocker
Import Rules (Merge): The file being imported will be merged with existing rules. If the rule does not exist, it will be added. If the rule already exist, it will be ignored.
Export Rules: All rules can be exported to a file. The file is automatically saved in the web browser’s Downloads folder. The filename is automatically generated, starting with SybuJsBlocker-[Bx-Ax-Wx]-<date>.json
Options for Temporary Rules added
User Interface
Indicators
JavaScript file was loaded. No rule was applied.
JavaScript file was allowed and loaded, based on Allow Rule.
JavaScript file was blocked, based on Block Rule.
1, 2, 3
The numbers next to listed items indicated the loaded sequence
The total number of files blocked. Click to sort.
Actions
Click to edit the Block Rules
Click to edit the Allow Rules
Click to add or remove sites that will always be blocked or always be allowed.
Click to view or add sites that are temporary allowed.
Click to edit the extension options
File is currently allowed. Click to add Block Rule
File is currently allowed. Click to remove Allow Rule
File is currently blocked. Click to remove Block Rule
File is currently blocked. Click to add Allow Rule
Feedback
Please let us know if you have found a bug, have a question or feature request on our Support page
Love the App
The Extension is free, there is no monetization, no trackers, no advertising. If you use the extension, please consider liking Sybu Data on Facebook, Instagram and/or giving it ⭐⭐⭐⭐⭐ on the Google Chrome Store. – This will be appreciated.
Like and Follow
