Glossary

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Ad Blocker(also: Adblocker, Content Blocker)

A browser extension or built-in feature that prevents advertisements, trackers, and other unwanted content from loading on web pages, typically by matching requests against blocklists such as EasyList or EasyPrivacy. Ad blockers can substantially improve accessibility by…

Background Script(also: Background Scripts, Background Page)

Code in a browser extension that runs independently of any specific web page, handling long-lived logic such as responding to browser events, managing storage, or coordinating with remote services. Under Manifest V3, background scripts are implemented as service workers rather…

Chrome Web Store(also: CWS)

Google's official marketplace for Chrome browser extensions, themes, and applications, organised into 18 categories including Accessibility, Privacy & Security, Productivity, and Shopping. Extensions submitted to the store undergo automated review and, in some cases, manual…

Content Script(also: Content Scripts)

Code injected by a browser extension that runs in the context of a specific web page, with direct access to the page's DOM via standard JavaScript APIs. Content scripts let extensions read and modify page content (including adding accessibility features such as contrast…

Manifest V3(also: MV3)

The current version of the Chrome extension manifest format, introduced to improve security, privacy, and performance over Manifest V2 (which is being deprecated). MV3 replaces persistent background pages with service workers, restricts remote code execution, and changes how…

Service Worker(also: Service Workers)

A JavaScript worker that runs in the background of a web page or browser extension, independently of any open tab. Service workers handle events such as network requests, push notifications, and background sync, and form the basis of progressive web apps and Manifest V3 browser…

WebExtensions API(also: WebExtensions, Web Extensions API)

A cross-browser standard for building browser extensions, supported by Chrome, Firefox, Edge, Opera, and other major browsers. It defines how extensions declare capabilities in a manifest.json file, inject content scripts, run background logic, and access browser APIs such as…

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