---
title: "MadSci Smart Stoich Calculator – Chrome extension stats, history and permissions"
description: "4 users, no ratings yet. Version 1.0, updated 2026-04-29. Requests 3 permissions."
url: "https://extensiontracker.com/extension/efmedolbdckffjfpedjnnfhgccgnmmba"
---

# MadSci Smart Stoich Calculator

Live in the Chrome Web Store.

- Users: 4
- Rating: no ratings yet
- Last checked: 2026-09-27 00:24 UTC
- Users gained in 7 days: – (needs a week of history)
- Users gained in 30 days: – (needs a month of history)
- Rank by users: #212,483 of 264,702 live extensions
- Rank in Tools: #81,382 of 103,498

## The listing

What the Chrome Web Store shows, as of the last check.

Summary from the listing:

> MadSci Smart Stoich: Chemistry with a Kick Take the headache out of stoichiometry with the MadSci Smart Stoich Calculator.…

- Extension ID: `efmedolbdckffjfpedjnnfhgccgnmmba`
- Developer: [Brock Lynch](https://extensiontracker.com/developer/ua50f0c6c0b1a183aea269d0a8ef6950a)
- Category: [Productivity › Tools](https://extensiontracker.com/category/productivity/tools)
- First published: 2026-04-29
- Last updated: 2026-04-29
- Version: `1.0`
- Size: 85.39 KiB
- Minimum Chrome: 88
- Languages (1): English
- Chrome Web Store: <https://chromewebstore.google.com/detail/madsci-smart-stoich-calcu/efmedolbdckffjfpedjnnfhgccgnmmba>
- View the code or download the CRX, in CRX Peek: <https://crxpeek.com/?id=efmedolbdckffjfpedjnnfhgccgnmmba>

## Users over time

One row per check, newest first, as shown on the Chrome Web Store.

| Checked | Users | Rating | Ratings |
| --- | ---: | ---: | ---: |
| 2026-09-27 | 4 | – | – |

## What changed

Every change found on a check, newest first.

No changes found since tracking began on 2026-09-27.

## What it can access

From the extension's manifest, in plain language.

### Sites

- `https://pubchem.ncbi.nlm.nih.gov/*`: pubchem.ncbi.nlm.nih.gov

### Browser features

- `contextMenus`: Add items to the right-click menu
- `sidePanel`: Show a side panel

## More from this developer

Other extensions from the same publisher account.

| Extension | Users | Rating | Ratings | Category |
| --- | ---: | ---: | ---: | --- |
| [Chrome Bookmarked Website Downloader](https://extensiontracker.com/extension/mfhhjeflfjjihgibjpdfkbmbeabbdgnb) | 224 | 1.00 | 2 | Workflow & Planning |
| [Mutable Butterfly](https://extensiontracker.com/extension/gneepfcaepglapiejkipkmlmjkphplog) | 18 | – | – | Developer Tools |
| [Spambot 2048](https://extensiontracker.com/extension/elcacaapfalknpbcamjhgepachcgjddo) | 6 | – | – | Just for Fun |
| [MadSci 3D Molecule Viewer](https://extensiontracker.com/extension/jnjdjgeeodnkcpjnhedkgpoomcllbmke) | 6 | 5.00 | 1 | Tools |
| [MadSci Chem Functional Group Visualizer](https://extensiontracker.com/extension/kfjbinfclmhmiobhienejngmpifgjfke) | 4 | – | – | Education |
| [Dodgemaster](https://extensiontracker.com/extension/bncmobnolehmkcfmbfjkodandlidldfg) | 2 | – | – | Just for Fun |

All 7 extensions by [Brock Lynch](https://extensiontracker.com/developer/ua50f0c6c0b1a183aea269d0a8ef6950a).

## About this data

Collected from the extension's public Chrome Web Store listing. It's checked every month, and again whenever a new version appears. Last checked 2026-09-27 00:24 UTC; next check around 2026-10-17.

How the data is collected: <https://extensiontracker.com/methodology>.

## Cite this page

Extension Tracker. “MadSci Smart Stoich Calculator” (efmedolbdckffjfpedjnnfhgccgnmmba). Chrome Web Store data, last checked 2026-09-27. https://extensiontracker.com/extension/efmedolbdckffjfpedjnnfhgccgnmmba. Accessed 2026-09-28.

```bibtex
@misc{extensiontracker_efmedolbdckffjfpedjnnfhgccgnmmba,
  title   = {MadSci Smart Stoich Calculator (efmedolbdckffjfpedjnnfhgccgnmmba)},
  author  = {{Extension Tracker}},
  year    = {2026},
  note    = {Chrome Web Store data, last checked 2026-09-27},
  url     = {https://extensiontracker.com/extension/efmedolbdckffjfpedjnnfhgccgnmmba},
  urldate = {2026-09-28}
}
```

---

From Extension Tracker, a public record of the Chrome Web Store: <https://extensiontracker.com/extension/efmedolbdckffjfpedjnnfhgccgnmmba>. It isn't affiliated with Google. The data is free to reuse under CC BY 4.0 (<https://creativecommons.org/licenses/by/4.0/>), crediting Extension Tracker. Extension, developer and list pages come as Markdown too: add `format=md` to the address, as in `https://extensiontracker.com/extension/{id}?format=md`.