Random User-Agent
30 Seconds of Knowledge
User-Agent Switcher and Manager
Chameleon WebExtension
Tampermonkey
Product Snacks
Violentmonkey
Privacy Possum
W3C Markup Validation Service
HTML Validator
Total Validator
PageSpeed Insights
Rocket Validator
GTmetrix
Nibbler
Scrutiny
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Based on our record, W3C Markup Validation Service seems to be a lot more popular than Random User-Agent. While we know about 95 links to W3C Markup Validation Service, we've tracked only 2 mentions of Random User-Agent. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
Use the following extension and set a Windows user agent: https://github.com/tarampampam/random-user-agent. Source: 12 months ago
It still doesn't make you safe from being tracked, it only makes you harder to track through fingerprinting and there are other methods to track you as well. A similar extension is also available for other browsers. Source: over 2 years ago
Validate Your Code Include tools like W3C code validation service and CSS validator to ensure your code meets web standards. - Source: dev.to / about 1 month ago
===> Click here to run your code through the HTML validator. - Source: dev.to / 5 months ago
Try looking at tools like https://validator.w3.org/. Source: 5 months ago
I'm looking for either that specific validator (older version of https://validator.w3.org/) or an equivalent that can validate pre-HTML5 (DTD-based) files in a similar fashion. I would appreciate any pointers in the right direction. Thanks in advance. Source: 11 months ago
Not an addon, but maybe it helps Https://validator.w3.org/. Source: 11 months ago
30 Seconds of Knowledge - Become a better developer, in every new tab.
HTML Validator - HTML Validator is a Mozilla extension that adds HTML validation inside Firefox and Mozilla.
User-Agent Switcher and Manager - spoofs browser's User-Agent string.
Total Validator - Total Validator can check your website to help ensure that it is accessible, uses valid HTML and CSS, has no broken links, and is free from spelling mistakes.
Chameleon WebExtension - Chameleon is a Firefox extension to Spoof your browser profile.
PageSpeed Insights - PageSpeed is addon for ...