Lexicon is an open-source project built for firefox users who need quick word definitions while browsing.

Yes — Lexicon is open source under the Open Source license and free to use.

What platforms does Lexicon run on?

Lexicon runs on the web and embeddable surfaces.

Is Lexicon still active?

Unverified. Lexicon has not been re-checked since it entered the index, so there is no finding either way — and only a positive finding would say otherwise.

What projects are similar to Lexicon?

Similar projects tracked by PulseGate include Lexicon Mastermind Challenge, LexEye, and Dictionary Plus.

Who develops Lexicon?

Lexicon is developed by akvedi.

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Lexicon

Name: Lexicon
Author: akvedi

github.comBrowser DevTools & extensions

Lexicon is an open-source Firefox add-on that displays a word’s definition in a pop-up bubble when the user double-clicks it. It is designed for readers who want quick dictionary lookups while browsing.

Open SourceWebEmbeddable

Visit github.com

Overview

4 features

Lexicon sits in PulseGate's Browser DevTools & extensions category. It focuses on looking up word definitions without leaving the page or opening a separate dictionary. It is built as an open-source project for firefox users who need quick word definitions while browsing. Lexicon is open source under the Open Source license. It runs on the web and embeddable surfaces.

akvedi builds and maintains Lexicon, and it first shipped in 2023. Among its 4 catalogued features are double-click lookup, definition pop-up, and instant dictionary.

Summary written by a language model from the project’s public pages.

Double-click lookup
Definition pop-up
Instant dictionary
Firefox integration

Built with & integrations

Runs on

BrowserEmbeddable

Trust & compliance

License

Open Source

Verified signals

HTTPSPrivacy Policy Terms of ServiceOpen SourceFree tierStore-verified publisher

Legal

Indexing history

What PulseGate has recorded for this listing

Indexed13 Sep · 12:56 UTC
Lexicon (Instant Dictionary) verified via Firefox Add-ons
Source: Firefox Add-ons · Open

Frequently asked questions about Lexicon

What is Lexicon?: Lexicon focuses on looking up word definitions without leaving the page or opening a separate dictionary. It is catalogued under Browser DevTools & extensions on PulseGate.
Who is Lexicon for?: Lexicon is an open-source project built for firefox users who need quick word definitions while browsing.
Is Lexicon free?: Yes — Lexicon is open source under the Open Source license and free to use.
What platforms does Lexicon run on?: Lexicon runs on the web and embeddable surfaces.
Is Lexicon still active?: Unverified. Lexicon has not been re-checked since it entered the index, so there is no finding either way — and only a positive finding would say otherwise.
What projects are similar to Lexicon?: Similar projects tracked by PulseGate include Lexicon Mastermind Challenge, LexEye, and Dictionary Plus.Lexicon Mastermind Challenge LexEye Dictionary Plus
Who develops Lexicon?: Lexicon is developed by akvedi.
When did Lexicon launch?: Lexicon first shipped in 2023.

At a glance

Pricing: Open Source
Platforms: Web
Languages: English
License: Open Source
Built for: Firefox users who need quick word definitions while browsing
Model: Open source
Solves: Looking up word definitions without leaving the page or opening a separate dictionary.

Registered as

Firefox Add-ons: lexicon

Developer

akvedi

Index record

Indexed: 13 Sep 2026
Lifecycle: Alive
Last seen: 13 Sep 2026

Identity audit (13)

Slug: lexicon-instant-dictionary-github-com
Lifecycle state recorded: 13 Sep 2026
Verification state: Indexed for public listing
Listing state: Listed: yes
Index status: Included in index
Latest evidence snapshot: 13 Sep 2026
Timeline basis: Indexed-at chronology. This listing's first-seen date was written by the catalog backfill, not observed here, so it is not treated as a sighting.
Name from: Written by a language model from the project's public pages.
Category from: Assigned by a language model.
Summary from: Written by a language model from public pages.
Languages from: Detected by a language model, checked against the page's own declaration.
Last updated: 13 Sep 2026
Canonical URL: https://github.com/akvedi/lexicon

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