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darkreader.org
Dark Reader is an open-source browser extension that enables a dark theme on websites for night and daily browsing. It is available for Chrome, Firefox, Edge and Safari, and its brightness, contrast and sepia settings can be adjusted and enabled for all sites or particular domains.
addons.mozilla.org
Sage-Like is a fast, lightweight sidebar-based feed reader extension for the Firefox browser. It supports Atom, RSS, JSON and RDF feeds, offers a customizable user interface, and integrates with Firefox bookmarks and sync functionality. It can discover feeds from the sidebar and address bar, including hidden RSS feeds on platforms such as YouTube, Reddit, DeviantArt, Pinterest and Behance, and has a customizable feed tree view.
github.com
Want My RSS is a Firefox extension that restores some RSS functionality the browser removed, including a URL bar indicator for available feeds, a feed preview page, and a subscribe button. Version 0.39 added Firefox for Android support, a toolbar feed counter, a system feed reader option, and requires Firefox 98 or newer.
github.com
Source code for Brief, a Firefox extension for reading RSS and Atom feeds. The repository links to the published add-on, documentation, and project support channels.
sagerss.com
Sage is a lightweight RSS and Atom feed reader extension for Mozilla Firefox. It reads RSS 2.0, 1.0, 0.9x and Atom feeds, provides customizable newspaper feed rendering via style sheets, includes feed discovery functionality, integrates with Firefox’s bookmark system, supports OPML feed list import and export, offers support for multiple locales, and has a simple one-step install and uninstall process.
allmangasreader.com
A browser extension for following updates of manga on online manga readers. It displays full chapter scans, helps track reading state and scores, and bookmarks scans. Versions are offered for Firefox and for Opera and Chromium-based browsers, and the beta channel provides features as they are developed.
gitflic.ru
A browser extension that lets users read articles from supported sites that implement a paywall, and allows adding a domain as a custom site. Weekly updates are released for fixes and new sites. Installation instructions are provided for Chrome and Firefox.
github.com
A custom deployment of Mozilla's PDF.js generic viewer packaged as a Web Extension, adding a reader mode that changes PDF colors plus features such as Auto-track Document Outline, Smart Zoom text and a Show/Hide toolbar. In Firefox it replaces the built-in PDF.js viewer; in Chromium browsers it coexists with the native viewer and opens PDFs via a context menu or toolbar button.
dotepub.com
Cloud-based software that converts webpages into e-books for e-readers. It is offered as a bookmarklet, browser extensions for Chrome, Firefox, Safari and Edge, a widget and an API. A Creator tool makes e-books from a text of one's own, and a WordPress plugin embeds the widget.
nodetics.com
Feedbro is a free RSS feed reader browser extension for Chrome, Vivaldi, Edge, Brave, and Firefox. It reads RSS, Atom, and RDF feeds and integrates with social media and content sites. It includes a rule engine for automated filtering, tree-based navigation with folders, feed autodiscovery, tagging, and partial-to-full article conversion.
readaloud.app
Read Aloud is a text-to-speech voice reader available as a Chrome extension that reads aloud the current web-page article with one click and supports 40+ languages. The site also lists browser extensions for Firefox and Edge and a TTS widget service.