Browser Extension Engineering
Custom intelligence overlays and browser utilities that interact securely with third-party web platforms.
- Timeline
- 6–12 weeks
- Engagement
- Senior, embedded
- Pricing
- Outcome-based
- Discipline
- Custom Software & SaaS Development
⏚ Summary
What this engagement is, plainly.
Browser extensions are the highest-leverage product surface most teams ignore. We build them with the security, performance, and store-policy discipline that keeps them shippable and unblockable.
Problems we solve
You want to overlay intelligence on a SaaS your team uses, but the vendor doesn't ship an API.
Your existing extension is fragile, fails store review, or breaks every Chrome version.
You need to interact with sensitive third-party data without compromising user trust.
⏚ Approach
How we run this engagement.
- 01Phase
Manifest V3 as the baseline
Service workers, declarative content scripts, strict CSP. We design for the current and next browser policy regimes, not the one being deprecated.
- 02Phase
Third-party DOM as contract
We treat the target page as an unstable API. Selector strategies, fallback flows, and contract tests that flag breakage before users see it.
- 03Phase
Security first
Permissions minimized, data flows audited, code signed. Store review is a side-effect of how we build.
⏚ Deliverables
What you get, signed off.
Manifest V3 extension across Chrome / Firefox / Edge
Selector strategy + breakage detection
Settings + auth flow
Update + version-pinning system
Store submission + review playbook
⏚ Stack we typically use
Tools, not religion.
We pick on workload and team shape, not on fashion. Anything below is a default — swappable when your context demands.
- TypeScript
- React
- Manifest V3
- Plasmo
- WXT
- Playwright
Outcome
An extension that passes store review on first submit, survives quarterly browser updates, and doesn't break when the target site redesigns.
⏚ Frequently Asked
About this service, specifically.
⏚ Related Services
Often paired with this engagement.
⏚ Engagement Initiation
Have a hard problem worth doing once, well?
We take a small number of engagements per quarter. If your program needs serious operators, we'd like to hear about it.