Chrome extension developer (Manifest V3)
Chrome extension development builds software that runs inside the browser, adding capability to websites you do not control. Asad Ghaffar, an AI Automation Expert & Full-Stack Developer based in Lahore, Pakistan, builds Manifest V3 extensions for teams whose daily work happens inside a web app that lacks the button they need.
This is the right service when your process is trapped in someone else's interface — a portal with no API, a supplier site your team re-keys data from, a dashboard that will not export. An extension reaches into that page and connects it to your own systems.
What's included in chrome extension development
Manifest V3 architecture and build tooling
Built on the current extension platform from the start, with the service-worker model and permissions structure Chrome now requires — not a Manifest V2 pattern retrofitted to pass review.
Content scripts that read and modify live pages
Scripts that extract data from a page, inject new interface elements, and react to dynamic content, written to tolerate the target site changing its markup rather than breaking on the first update.
Background service workers and event handling
Long-running logic in the service-worker model, including alarms, message passing, and state that survives the worker being suspended — the detail most Manifest V3 migrations get wrong.
Popup, options, and side-panel interfaces
The extension's own interface built as a real application, with settings your team can change themselves rather than values hardcoded at build time.
Authentication and secure API communication
OAuth flows and token handling done inside the extension's security model, with secrets kept out of content scripts where any page could reach them.
Chrome Web Store packaging and submission
Store listing, privacy disclosures, permission justifications, and the review submission itself — including the narrow permission scoping that determines whether a review passes or gets rejected.
How the work runs
- 01
Identify the trapped workflow
We look at the site your team works in and the steps they repeat there, then decide what the extension should do at each point — read, inject, automate, or simply shortcut a sequence of clicks.
- 02
Scope permissions deliberately
Permissions are chosen as narrowly as the feature allows. This is a design decision, not paperwork: over-broad host permissions are the most common reason a Chrome Web Store review is rejected.
- 03
Build against the live target site
Content scripts are developed and tested against the real page, including its logged-in state and dynamically loaded content, with selectors written defensively so a markup change degrades rather than breaks.
- 04
Package, submit, and iterate on review
The extension is packaged, the store listing and privacy disclosures written, and the submission taken through review, including responding to reviewer questions if they arise.
Delivered work
No published case study yet for this service. Previous extension work includes a car-bidding Chrome extension with real-time bidding functionality, built during the Frontend Developer role at P2P Clouds — a role evidenced by the experience letter published on the about page.
Tools used for this service
- Manifest V3
- JavaScript
- TypeScript
- Chrome Extension APIs
- Service Workers
- React
- OAuth 2.0
- REST APIs
- Chrome Web Store
Chrome Extensions — frequently asked questions
How much does it cost to build a Chrome extension?
Cost is driven by how much of the target page the extension must understand, whether it needs authentication against your systems, and whether it is published publicly or distributed privately to your team. A single-purpose internal extension is a substantially smaller build than a public Web Store product. Both are quoted after a scope call.
Can you migrate our Manifest V2 extension to V3?
Yes. Manifest V2 to V3 migration is mostly a rearchitecture rather than a rename: persistent background pages become service workers that can be suspended at any moment, blocking network interception is replaced by declarative rules, and remotely hosted code is no longer permitted. The migration reworks those parts and re-verifies behaviour against the live site.
Can the extension send data to our CRM or internal API?
Yes. Extensions can authenticate against your systems and post captured data directly, which is the most common reason to build one. Credentials are handled in the extension's background context rather than in content scripts, so page-level JavaScript on the sites your team visits cannot reach them.
Do we have to publish it on the Chrome Web Store?
No. Extensions can be distributed privately to a known set of users or deployed across your organisation through managed policy without a public listing. Private distribution also avoids the public review cycle, which shortens the path to a working internal tool.
What happens when the target website changes its layout?
Content scripts are written defensively, preferring stable attributes over brittle CSS paths, so a cosmetic redesign usually does not break them. A structural change can, which is why extensions that depend on a third-party site are best kept under a maintenance arrangement agreed as part of the original scope.
Related services
Ready to scope your chrome extensions project?
Describe the process or product you have in mind and you will get a proposed approach, the tools it would use, and an estimated build time before any commitment.
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