Extensions
Hex Calculator
Perform quick and accurate hexadecimal calculations — addition, subtraction, multiplication, and division with remainder — directly in your Opera browser.
CSSViewer
CSSViewer
Extensions for Mermaid
A browser extension for Chrome, Opera & Firefox that adds Mermaid language support to GitHub. A fork from the not updated GitHub + Mermaid extension.
Browser Update Watchdog
Notifies you, whenever your browser has been automatically updated.
Extension source viewer
View source code of extensions in the Chrome Web Store, Firefox or Opera addon gallery. Has button to install from Chrome Web Store.
Copy Title And Url
Copy the title and url in markdown, pukiwiki, html format.
PerfectPixel by WellDoneCode
This extension helps develop your websites with pixel perfect accuracy!
OCR - Image Reader
A powerful optical character recognition (OCR) extension to capture and convert images to text
Font Finder
An easy-to-use font inspector to get CSS styles of the selected element
FullScreen for Opera
Fullscreen, #1 Zoom and Dark Mode more options will get in one
SEO-tools
SEO-tools - information about domains, site audit for SEO errors, as well as technical audit of any page. Over 100 online services
JSON Lite
Fast JSON viewer - highlights, shows items count/size, handles large files
Fontstorage
The simplest extension for identifying and selecting fonts on a website.
GrabzIt Web Scraping Assistant
Create Web Scrapes online easier than ever before with GrabzIt's Web Scraping Assistant.
Image Resizer
Rescale multiple images into different sizes in a single step
Image Extractor
Extracts image names and allows copying image URLs.
Yandex Wordstat Regions
Расширение, возвращает полное дерево регионов РФ в сервис подбора слов Яндекс (wordstat)
Page Edit
Make any webpage into a content editable document and modify it via toolbar popup!
Clear Cache
Clear your cache and browsing data with a single click of a button.
Octotree
GitHub on steroids
Picture in Play
Indicates whether the `picture` element is in use on a page.
JSON Formatter & Beautifier
makes it simple to read JSON Code for browser
Web Edit
Easily edit websites temporarily with a click of a button.
Disable Cookies
Disable cookies for current domain.
Modify Header Value
Add, modify or remove a header for any request on desired domains.
Youtube converter button - YTLoad
YouTube downloader FREE - Convert videos to MP3 MP4
Font Inspector
Click on any HTML element to get the font info in a popup!
SeoQuake extension
SEOquake is a free plugin that provides you with key SEO metrics, along with other useful tools such as SEO Audit and many others
CSS & JS Injector
Easily customize your browsing experience CSS & JS Injector is a tool for developers, designers, and power users. Apply custom CSS styles and JavaScript to specific websites effortlessly. Boost productivity and customize the look, feel, and functionality of websites without altering its source code.
Caffeine
Keep awake which prevents the OS from automatically going to sleep, dimming the screen or starting screen savers
Custom Style Script
Add Custom JavaScript (JS) Code or Styles (CSS) to any page.
Wayback machine website
Online service that have 452 billion web pages saved over time and who is domain tool in context menu