Enhancement of your browsing history

Promnesia promo image
What is Promnesia?

Promnesia is a Firefox add-on by Dima Gerasimov. This add-on has 68 daily active users and a perfect 5.0 rating. The latest version, 1.2.1, was updated 4 days ago.

Stats date:
Users: 68 ▼ -1
Rating: 5.00 (6)
Version: 1.2.1 (Last updated: 2023-01-30)
Creation date: 2019-06-15
Weekly download count: 1
Firefox on Android: Yes
Manifest version: 2
  • file:///*
  • https://*/*
  • http://*/*
  • storage
  • webNavigation
  • contextMenus
  • notifications
  • bookmarks
  • history
Featured: No
Size: 989.82K
Email: Click to see
Risk impact: High risk impact
Risk likelihood: Moderate risk likelihood
Found a bug?

Other platforms

Not available on Chrome
Not available on Edge
Promnesia is a browser extension (Chrome/Firefox/Firefox mobile) which serves as a web surfing copilot, enhancing your browsing history and web exploration experience. 

TLDR: it lets you explore your browsing history in context: where you encountered it, in chat, on Twitter, on Reddit, or just in one of the text files on your computer.
This is unlike most modern browsers, where you can only see when you visited the link.

It allows you to answer different questions about the current web page:

- have I been here before? When?
- why have I bookmarked it?
- how did I get on it? Which page has led to it?
- who sent me this link? Can I just jump to the message?
- which links on this page have I already explored?
- which posts from this blog page have I already read?

NOTE: to get the most benefits from the extension, you also need to set up a supplementary service. You can find the instructions here.
Risk impact

Promnesia requires a number of risky permissions that can potentially harm your browser and steal your data. Exercise caution when installing this add-on. Review carefully before installing. We recommend that you only install Promnesia if you trust the publisher.

Risk impact measures the level of extra permissions an extension has access to. A low risk impact extension cannot do much harms, whereas a high risk impact extension can do a lot of damage like stealing your password, bypass your security settings, and access your personal data. High risk impact extensions are not necessarily malicious. However, if they do turn malicious, they can be very harmful.

Risk likelihood

Promnesia is probably trust-worthy. Prefer other publishers if available. Exercise caution when installing this add-on.

Risk likelihood measures the probability that a Firefox add-on may turn malicious. This is determined by the publisher and the Firefox add-on reputation on Firefox Browser Add-ons, the amount of time the Firefox add-on has been around, and other signals about the Firefox add-on. Our algorithms are not perfect, and are subject to change as we discover new ways to detect malicious extensions. We recommend that you always exercise caution when installing a Firefox add-on, especially ones with higher risk impact and/or higher risk likelihood.

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User reviews

by Sean, 2021-12-20

Excellent & promising extension. It should work out of the box with local in-browser storage of metadata, but it starts shpow its strength when index & localhost-server is started. But then, the bar is raided, because you need to install data-extractors from your various sites (twitter, DO, google) to feed this beast :-) And the procedure for taking control of is not easy. I wish it had a section for android & how to install the server to a remote VM, and communicate through e.g. ssh-tunneling. Although i can install it on Firefox-nightly("fenix")[1] following the official-procedure for custom-collections[2], it's the server-part that's bugging me. [1]: [2]:
by ankostis, 2021-02-11
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The manifest file declares the requirements and permissions that a Firefox add-on will have access to. By reviewing the manifest, you may be able to determine if a Firefox add-on is over-reaching (for example, if an extension is overriding your new tab page, or search provider, or requesting access to your web activities without any good reason).

  "background": {
    "scripts": [
    "persistent": false
  "options_ui": {
    "page": "options_page.html",
    "browser_style": true,
    "open_in_tab": true
  "manifest_version": 2,