Browser Extension
Extension
from€1,490
Extension for Chrome, Firefox and Edge — one codebase, Manifest V3, with store listing setup.
Package contents
- Manifest V3 (future-proof; Manifest V2 phasing out end of 2024)
- Chrome, Firefox and Edge from one codebase
- Popup UI on click of toolbar icon
- Options page with settings
- Content script for webpage interaction (read/manipulate DOM)
- Background service worker for persistent logic
- Local storage (chrome.storage.local) for user data
- Minimal permissions (privacy-first, no broad <all_urls>)
- Optional: sync storage (share data between browsers)
- Chrome Web Store submission performed
- Firefox Add-ons (AMO) submission performed
- Microsoft Edge Add-ons submission optional
- Auto-update via browser-native (stores handle it)
- Source code + docs in repo
What's not included
- Chrome Web Store Developer Account (5 USD one-time — you pay)
- Firefox AMO is free
- Native mobile browser extensions (Firefox Mobile separate from 590 EUR)
- Safari extension (completely different, separate from 1490 EUR)
- Advertising / promotion in stores
- User tracking / analytics (privacy-first)
- Complex backend connection (separate as API Backend package)
These items can be requested separately — we make an individual offer.
Security comes standard.
These items come with every package – including this one:
- HTTPS / SSL with auto-renewal
- Firewall, brute-force protection & rate-limiting
- Dependency scan for known CVEs
- Backup strategy in place
- No secrets ever in the repository
- GDPR-compliant cookie banner (for EU clients)
- Code review and release gate before go-live
- 30 days post-launch support (bugfixes included)
What clients usually ask
Why no Safari?
Safari extensions use a completely different system (App Extension via Xcode), is its own package (1490 EUR add-on).
How fast is the extension approved in the store?
Chrome Web Store: 1-3 days. Firefox AMO: often within hours. Edge Add-ons: 1-7 days.
What if the store rejects the extension?
We help with adjustments — mostly permissions issues. Escalation: hourly rate.
Can I distribute the extension outside the store?
Yes, self-hosted is possible (user installs directly from your website). Self-hosted is more complex on Chrome.
Updates — how does it work?
Stores auto-update in background once you upload a new version. Users don't notice.
What if Manifest V3 is extended (V4 etc.)?
We migrate as needed — hourly rate or small flat fee. V3 has frequent updates, very stable.
Important note
The price shown is a non-binding estimate. Actual effort is determined individually after a free briefing call and provided in writing.
Have a project?
Tell us what it is about. In a first conversation we work out with you whether and how we can help – free and without obligation.