Html Validator
HTML Validator is a Mozilla extension that adds HTML validation inside Firefox, Mozilla. The number of errors of a HTML page is seen on the form of an icon For Firefox 56, use 0.974 (see all versions below). For Firefox 57, see Web Extensions.
13,105 users
Flagfox
Displays a country flag depicting the location of the current website's server and provides a multitude of tools such as site safety checks, whois, translation, similar sites, validation, URL shortening, and more...
137,757 users
defyFormValidation
Deactivates HTML5 form validation for testing server-side or alternative client-side (e.g. JavaScript-based) validation methods.
150 users
Yet Another W3C Validator
YAW3CV: Validate HTML using local/remote W3C page validation service
53 users
eIDAS QWAC Validator
This add-on shows a grey EU-flag badge at the right of the address bar, that gets coloured in case the origin of the visited site is authenticated by means of a qualified web-access certificated (QWAC) pursuant to the “eIDAS” European Regulation.
34 users
Validate HTML
Submits the HTML of the current tab to the W3C Validator. Source submitted is from a GET request not the DOM. Written out of the need to easily validate protected directories. Not advisable for use on pages with sensitive information.
48 users
BiliData
The BiliData data analysis platform supports use in video / uploader space / BiliData. Using this extension, it is convenient to directly analyze related data at BiliData or collect data to BiliData.
41 users
ChroPath
ChroPath helps to generate and validate selectors like relative xpath, cssSelector etc with iframe support.
6,333 users
SEO Audit Tool
Website analysis & SEO tool by iwebchk provides comprehensive website review in SEO, performance, validity, security, accessibility, social media, backlinks, visitors, technologies and usability.
349 users
Avast SecureLine VPN
Control your Avast SecureLine VPN from the comfort of your browser. Easily turn your VPN on and off, or change your server location, with our simple but powerful extension. All you need is Avast SecureLine VPN with a valid license.
7,949 users
Zulu
Searches webpages for valid phone numbers and turns them into tel links or sends them directly to the Zulu client application itself
188 users
Stylus
Redesign your favorite websites with Stylus, an actively developed and community driven userstyles manager. Easily install custom themes from popular online repositories, or create, edit, and manage your own personalized CSS stylesheets.
66,545 users
Web Developer Form Filler
This extension is used by developers to make it easy to save and fill forms for use in submission testing and validation.
669 users
Brazilian Portuguese Dictionary (Former Spelling)
The same spellchecker shipped with the Brazilian version of Firefox, just using the former spelling (which is valid until January 1st 2016).
1,467 users
Zoom Page WE
Zoom web pages (either per-site or per-tab) using full-page zoom, text-only zoom and minimum font size. Fit-to-width zooming can be applied to pages automatically. Fit-to-window scaling can be applied to small images.
23,632 users
DoPeopleSay
A full-text search engine of English spoken corpus. Find the context where English word or phrase is used. Not sure if it's valid or not - give it a try too!
47 users
Decode On Copy
Automatically base64 decodes any text copied to the clipboard if that text can be decoded to a valid URL.
24 users
Email Verifier
MailDump Verifier, a powerful tool that helps verify an email address or validate email addresses in bulk as you go, whilst you browse websites. The MailDump Verifier removes invalid email addresses and reduces bounce rates.
49 users
