Firefox add-on with keyword - html

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.

Automatically redirects AMP pages to the regular web page variant.

Save an entire web page—including images and styling—as a single HTML file.

Scrape HTML Table Data to Clipboard or Save-to-File in either CSV or TAB delimited with options

Copy HTML source text. Keyboard shortcut F8.

Open SWF links of Adobe Animate (Flash) in a pure sandboxed JavaScript emulator

Download as a single html file for the current page with images and styles.

Auto Save HTML is a small extension which can be used to automatically download the HTML document(s) of a specified website when browsing that same website.

Blocks desired HTML contents (script, style, image, object, media)

Save the title and URLs of open tabs as an HTML file.

Easily remove desired HTML5 elements with just one click!

WebStudio, a HTML editor online to create and edit any webpage using a web browser.

Renders some rss feeds as html

This extension will allow you to easily insert HTML code into the body of the message from your favorite webmail service: Gmail, Outlook, and Yahoo Mail.

Take a full page screenshot and save it as an offline HTML file.

Disable autoplay and preloading of HTML5 video and audio players.

This extension shows information about a web page's HTML elements as you hover over them. The details are displayed in a text stripe at the top of the screen. Clicking on the text stripe will toggle it between top and bottom placement.

Adds DuckDuckGo HTML as a search engine for a non-JavaScript experience

Addon for web devs. Monitor included JS, CSS and/or HTML in frames and automatically reload the host page when a change is detected in the included source. Supports inline reloading of stylesheets and frames without reloading the host page.

Play YouTube™ Videos in Flash or HTML5 Player

Add functions for Gmail Basic HTML view

Replace video player with Firefox native video player

Adds a toolbar button to toggle between Flash and the default HTML players

The fastest and smartest way to analyze HTML elements and generate full React component representations.

Copy HTML link, good for pasting into documents or emails. Available through the context menu or in the page action menu (the menu on the URL bar)