Extensions
Browser extensions are small software programs that can be installed in web browsers to add additional features or functionality. They are designed to enhance the browsing experience by providing additional functionality such as blocking ads, checking spelling, or providing security.
Browser extensions can be installed from the web store of the browser you are using, such as the Chrome Web Store or the Firefox Add-ons Marketplace. Once installed, they can be accessed and managed through the browser's settings or preferences menu.
Some common types of browser extensions include ad blockers, spell checkers, password managers, and privacy tools. There are also extensions that can customize the appearance of a webpage, such as themes or skins, and extensions that can add new features to social media sites or other online platforms.
Good
Dark Reader | 

Dark Reader is an eye-care extension that provides a dark mode for every website, making it easier on the eyes during night and daily browsing. With Dark Reader, you can enjoy a high-contrast dark theme on any website, improving readability and reducing eye strain.
Behind The Overlay | 

Behind The Overlay is a convenient browser extension that allows you to close any overlay on any website with a single click or keyboard shortcut. It provides a hassle-free way to remove overlays that obstruct content and improve your browsing experience.
BetterTTV | 

BetterTTV, also known as BTTV or Better Twitch TV, is a popular extension that enhances the Twitch and YouTube platforms with new features, emotes, and more. Its goal is to improve the user experience and provide additional functionality for users on these platforms.
Volume Master | 

Volume Master is a simple and reliable volume booster extension that allows you to boost the volume of audio in your browser up to 600%. With fine-grained control, you can adjust the volume of any tab playing audio according to your preference. It also provides a convenient feature to switch to any tab playing audio with just one click.
Hover Zoom+ | 

Hover Zoom+ is an open-source extension that allows you to zoom in on images and videos on various websites such as Reddit and Amazon. By hovering your mouse over an image, the extension automatically enlarges it to fit within the browser window.
Privacy
Proton Pass | 

password manager created by the former scientists who met at CERN behind Proton Mail, the world’s largest encrypted email provider. Proton Pass is open-source, end-to-end encrypted, and protected by Swiss privacy laws.
Pass offers more than other free password managers and has no ads or data collection. You can use it for free forever on all your devices to create and store unlimited passwords, autofill logins, generate 2FA codes, create email aliases, secure your notes, and more.
Proton VPN | 

ProtonVPN is a Swiss-based VPN service known for its strong commitment to privacy and security, offering a variety of features including a strict no-logs policy, DNS leak protection, and a secure server network. It supports multiple protocols, including OpenVPN, IKEv2, WireGuard, and Stealth, and has passed an independent security audit. Despite its advantages, ProtonVPN has faced criticism for not supporting the permanent kill switch and split tunneling simultaneously, which are features offered by other VPNs. Additionally, some users have reported DNS errors and issues with server speeds, indicating areas for improvement. ProtonVPN also offers a user-friendly interface and is available on various platforms, including Windows, macOS, Linux, iOS, and Android.
Privacy Badger | 

Privacy Badger is an advanced browser extension that automatically learns to block invisible trackers, enhancing your online privacy. Instead of relying on predefined lists, Privacy Badger dynamically identifies and blocks trackers based on their behavior. It actively protects your privacy by sending the Global Privacy Control signal to opt out of data sharing and selling, as well as the Do Not Track signal to inform companies not to track your online activities. If trackers persist in ignoring your preferences, Privacy Badger will adapt and learn to block them.
Decentraleyes | 

Designed to protect your online privacy by preventing tracking through centralized content delivery networks. It works by intercepting requests for commonly used content from networks like Google Hosted Libraries and serving local files instead. By doing so, it improves your privacy while maintaining the functionality of websites, making it an excellent complement to regular content blockers.
ClearURLs | 

ClearURLs is a powerful browser extension designed to enhance your online privacy by removing tracking elements from URLs. It automatically detects and removes unnecessary tracking codes that websites often include in URLs to monitor your online activities. By eliminating these tracking elements, ClearURLs helps protect your privacy while browsing the internet.
Cookie AutoDelete | 

Youtube
Return YouTube Dislike | 

Return YouTube Dislike is a powerful browser extension that restores the ability to see dislikes on YouTube. Following YouTube's removal of dislike visibility from their API on December 13th, 2021, this extension aims to empower users by utilizing archived like and dislike data, as well as data generated by extension users themselves, to provide accurate ratings.
SponsorBlock | 

Available for Chrome and Firefox that enhances your YouTube viewing experience by allowing you to skip sponsors, intros, outros, subscription reminders, and other annoying segments in YouTube videos. This crowd sourced extension enables users to submit the start and end times of sponsored segments, which are then shared with other extension users, allowing everyone to skip those segments seamlessly.
DeArrow | 

DeArrow is a browser extension for YouTube that crowdsources better titles and thumbnails to combat sensationalism. Users can submit and vote on improved titles and screenshots from specific video timestamps. If no submissions exist, DeArrow can automatically format the original title according to user preferences, maintaining proper capitalization. For thumbnails, DeArrow defaults to displaying random screenshots from videos, avoiding overstimulating auto-generated thumbnails. It uses its server to select timestamps and cross-checks with the SponsorBlock database to avoid sponsor segments. Unlike Clickbait Remover, DeArrow emphasizes crowdsourcing, supports various casing styles for titles, and uses truly random timestamps for thumbnails. Its goal is to enhance title accuracy and thumbnail relevance while minimizing clickbait tactics on YouTube.