Safebooru is an anime and manga picture search engine. Images are updated hourly, and the site states it serves 4,959,920 posts. It runs Gelbooru Beta 0.2.0 and an original concept by Danbooru. A search plugin is available for Firefox.
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Scholar Key is a Firefox browser extension. It automatically adds shadow library and institutional access links next to DOI links on webpages, and displays Wikipedia citation counts for those DOIs. Users can configure enabled sources, reorder or edit source entries, and add their institution's library access via a maintained libproxy database. Default sources include Anna's Archive Search, Anna's Archive SciDB, and Sci-Hub.
Sci Hub Now is a browser extension for Firefox, Chrome, and Edge. It provides one-click free access to academic papers via Sci-Hub. Users can manually install the latest release if store-published versions are under review.
ScriptCat is an open-source browser script engine distributed as a browser extension. It executes user scripts and is compatible with Tampermonkey scripts, offering additional features. The extension is available for Chrome, Edge and Firefox.
Scroll Anywhere is a Firefox browser extension that enables page scrolling without interacting with the browser scrollbar. Users can press the middle, right or left mouse button anywhere on a page to scroll, and the extension also supports grab-and-drag scrolling, customizable scrollbars, and momentum auto-scroll. It is also available for the Thunderbird 78 email client.
Search All is a multi-search platform that combines multiple AI search engines and chatbots, private web search engines, image and video search, shopping sites and social media networks in one tab. It offers browser extensions for Chrome, Edge and Firefox and an Android app, plus an AI image and video generator.
SelectON is a browser extension for Chrome and Firefox that provides a popup with actions on selected text. Features include copy or search in one click, a currency converter, unit and timezone conversion, and contextual buttons.
Session Alive is a Firefox and Chrome add-on for keeping a website session alive to avoid session timeout messages. Rules can use a background request via AJAX or a foreground request, with a rule name, trigger URL and request interval. Background requests support an asterisk wildcard in the trigger URL.
Sessionic is a web extension for saving, managing and restoring sessions, windows and tabs. It offers session import and export, automatic saving at set intervals, URL filtering with match patterns, tags for sessions, light and dark modes, and cross-browser support for Firefox, Chrome, Edge and Opera. It is compatible with Session Buddy, OneTab and Tab Session Manager.
Shodan is the world's first search engine for Internet-connected devices. It enables users to discover internet-connected devices from power plants, mobile phones, refrigerators and Minecraft servers, monitor network exposure of devices directly accessible from the Internet, use internet intelligence on how products are changing over time, and use our API and Chrome Extension and Firefox Add-on. The platform crawls the entire Internet every week.
Shortkeys is a free and open source browser extension for Chrome and Firefox that lets users customize keyboard shortcuts. It provides over 100 built-in actions covering tab management, scrolling, navigation, zoom, bookmarks, downloads and video controls, along with custom JavaScript actions, shortcut packs, groups, macros, a shortcut recorder and cloud sync.
Sidebery is a Firefox extension that provides a configurable sidebar for managing tabs and bookmarks. It offers panels of different types, including vertical tab panels with tree or flat layout, bookmarks, and history. It may conflict with addons that handle new tab position or that move or sort tabs.
SingleFile is a web extension and CLI tool that saves a complete web page into a single HTML file. It is compatible with Chrome, Firefox, Microsoft Edge, Safari, Vivaldi, Brave, Waterfox, Yandex browser, and Opera. Users can save the current tab, selected content, selected frames, or multiple tabs, and can annotate pages with highlights and notes.
MAL-Sync is a browser extension that integrates MyAnimeList, AniList, Kitsu, Simkl, Shikimori, and Mangabaka into various sites, with automatic episode tracking. It lets users search, update, and manage their lists from the extension popup and shows Discord rich presence. It is available for Chrome, Firefox, Opera, and as a userscript.
Browser extension for Smart Mute, adding useful tools or workflow improvements inside the browser.
SmartUpscale is an extension for Firefox and Chrome that applies integer scaling to images on webpages, preventing blur on images whose displayed size is an integer multiple of their real size. It is aimed at high pixel density displays. The scale is calculated per image, and options and limitations are documented.
SocialFocus is a browser extension that hides distracting and addictive elements of social media sites so users can personalize their feeds. It covers 7 websites with more than 115 options and is available for Safari, Chrome and Firefox. Key features include one-tap activation, password protection against unauthorized settings changes, and launch tweaks.
SoundFixer is a WebExtension for Firefox that addresses sound problems on the web, such as audio in one channel only, volume too quiet at maximum or too loud at minimum. It is distributed through addons.mozilla.org. It does not work on all websites because the Web Audio API cannot be used from a cross-domain source.
SpeedyApply is a job application autofill tool offered as a free browser extension for Chrome, Edge and Firefox. It automatically fills out and tracks job applications, and a Premium option is available with a 3-day free trial.
HizSearch Steam Button is an open-source browser extension and userscript that enables one-click searches for Steam games on the HizSearch game search engine. It operates on Steam Store and SteamDB app pages. The tool can be installed in the Steam Client browser, Chromium-based browsers, Firefox, or via userscript managers. Users can configure the button's position, icon visibility, and new-tab behavior, and the project is released under the MIT license.
A collection of guides on building and customizing startpages. Topics include reverse image searching, setting the new tab page in Chrome and Firefox, creating search bars with DuckDuckGo, and building terminal-like and basic startpages. The guides are not categorized, and the author states none are made for a specifically technical audience.
Stylebot is a browser extension that lets users point at elements on a page and change them; it writes the CSS and loads the style each time the user returns. It is free and open source for Chrome, Firefox and Edge on desktop, and includes a CLI.
Stylus is a browser extension for restyling websites, derived from the Stylish extension's version 1.5.2 source code. It allows users to install themes and styles, write custom CSS, and import databases from Stylish. Analytics and data collection were removed. It is available for Chrome, Firefox and Opera, and supports automatic updates of installed styles.
Stylus is a browser extension that restyles websites via CSS themes. It is compatible with Chrome, Firefox, and Chromium-based browsers, and supports UserCSS styles installable from a plain text URL. It includes a built-in editor for CSS themes and cloud sync for Dropbox, GDrive, OneDrive, or WebDAV-compatible servers.