Custom Chrome Extension Development

Chrome extension development from a written spec through to a published Chrome Web Store listing. We build background workers, popup and options UIs, and the API integrations an extension actually needs, on clean Manifest V3 code.

From $800, depending on the Chrome APIs involved and how much the popup UI needs to do.

What Chrome extension development covers

An extension is a small, focused piece of software living inside the browser, and it needs the same discipline as any other product: a clear spec before any code, and a permissions model that asks for no more access than the extension actually uses.

• A popup and options UI designed to match your brand.
• Background service workers handling the logic that runs without a visible window.
• Content scripts that read or modify the pages a user visits, scoped to exactly what is needed.
• Chrome storage and sync so settings follow a user across devices.
• OAuth 2.0 authentication where the extension needs to identify a user.
• Chrome Web Store submission, listing copy and screenshots, and handling any review feedback.

Manifest V3, and why it matters

Manifest V3 is the current extension platform Chrome requires, and it changes how background scripts and permissions work compared with the older model. Building on it from the start avoids a rewrite later, and respecting the browser's own security boundaries around what a content script can read from the pages it runs on is part of that from day one.

Reference: Same-origin policy (web.dev)

The process

Spec and architecture first: permissions, storage model and user flows agreed before a line of code is written. UI design next, then core development, then testing across Chrome versions, then the Web Store submission itself, including responding to any review feedback Google raises.

What this solves

Most extension projects we take on fall into one of two situations.

• An idea that needs building from scratch, with no existing code to work from.
• An existing extension stuck on the older Manifest V2 platform, needing a rebuild to stay listed as Chrome phases the old model out.

Related reading

What a Chrome extension project typically costs, and what drives the number up or down, is covered at /blog/what-it-costs-to-build-a-chrome-extension.