Block Unreachable Scripts

Prevent unreachable servers from stalling websites by disabling their scripts for 5 minutes if they previously could not load.

What is Block Unreachable Scripts?

'Block Unreachable Scripts' is a Chrome extension that protects site performance by monitoring JavaScript loading and blocking scripts from previously failed, unreachable servers, improving loading time. Blocking occurs for a 5-minute interval and can be checked via the toolbar button. It doesn't use blacklists or white lists, thus targeting no one specifically.

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Stats

By: em_te

View on Chrome Web Store

Users: 943 ▲ 13

Rating: 4.20 (5)

Version: 0.4 (Last updated: 2017-09-26)

Creation date: 2017-09-26

Risk impact: High risk impact

Risk likelihood: Very low risk likelihood

Manifest version: 2

Permissions:

<all_urls>
webRequest
webRequestBlocking
storage
tabs

Size: 11.32K

Email: em*****@hotmail.com

URLs: Privacy policy

Stats date:

Chrome-Stats Rank

# 30211 ▲ 52

Other rankings

#1082 in Workflow & Planning ▼ 2

#72 in script keyword 44 ▲ 1

#92 in wait keyword 5 ▲ 16

#131 in block keyword 85 ▲ 29

#176 in javascript keyword 42 ▲ 25

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Other platforms

Not available on Firefox

Not available on Edge

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Summary

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Some websites load JavaScript from third-party servers that are sometimes unreachable (because of firewalls/DNS/bad SSLs/Google down/etc.). This will cause the website to stall (freeze) as it waits for that server to respond. The only recourse is to wait patiently for that request to time out, before the website can continue loading.

This extension will monitor those failed JavaScript requests and will skip over them if any websites try to load from those servers again. This prevents the website from stalling again. The block will only occur for 5 minutes in case the server is restored later.

Failed requests can be viewed in the toolbar button, which shows which URLs were blocked and how long the block will last. The toolbar button only appears when scripts are blocked.

Note that this extension does not target anyone and has no black-list or white-list. Blocking only occurs if the server was previously unreachable and therefore the content would not have loaded anyway.

Test the effects of unreachable servers here: http://tinyurl.com/test-blocking-js

User reviews

Good idea but essentially unusable in its present implementation. It makes a large number of websites mostly or partially unusable, sometimes starting right at their login pages. This needs an adjustable global timeout, and per-site timeout adjustment. E.g., if a slow site sometimes takes 20 sec. to load, I would want to set maybe a 40-sec. timeout for elements on that page, and not block any of them unless they take longer than that. For a site that almost always loads in 3-5 sec., I might set it at 10 sec. (That extra padding will account for my typical VPN usage.) I can't tell what the defaults are, but I'm guessing around 5 sec., since this breaks even pretty basic and quick-to-load sites like LastPass.com (was able to login, but the script to create a new entry from the "+" icon apparently takes a hair too long for Block Unreachable Scripts, so this basic function of the site can't be used at all with this extension enabled (not that I'll be using LastPass much longer anyway, but it's just one example of breakage).

Stanton McCandlish, 2021-04-01

Very good, but needs some adjustment. Clicking on signup on stackoverflow.com and then picking google, this script will prevent from reaching google.

Prime Optimus, 2018-08-24

在这样的环境还有国产的插件，绝壁支持啊。有没有类似page load time的插件啊，这插件看的不是很懂，能看到DNS解析时间，方便调整分流DNS

Ken, 2017-11-17

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Safety

Risk impact

Block Unreachable Scripts is risky to use as it requires a number of sensitive permissions that can potentially harm your browser and steal your data. Exercise caution when installing this extension. Review carefully before installing. We recommend that you only install Block Unreachable Scripts if you trust the publisher.