British English Dictionary (Marco Pinto) per Marco A.G.Pinto

British English Dictionary V4
For Firefox, Thunderbird, and SeaMonkey
A carefully maintained, community-driven resource for accurate British English spelling.



📢 Update

As of March 2025, this dictionary fully aligns with modern -ise verb spellings (e.g., “organise”).
For specific -ise/-ize variants, some verbs and words MAY be missing or incorrectly included.



🔗 Websites

• Website: https://proofingtoolgui.org (Proofing Tool GUI)
• Website: https://github.com/marcoagpinto/aoo-mozilla-en-dict (GitHub)
• Website: https://linkedin.com/in/marcoagpinto (LinkedIn)

🌟 Key Features

• 145,000+ words added since 2013 (updated to V4)
• Based primarily on Oxford and Collins dictionaries
• Covers both modern and literary vocabulary
• Compatible with Commonwealth/European English variants

🔍 Inclusion Rules

1. Words must appear in at least two authoritative sources (e.g., Oxford + Collins) (except proper nouns)
2. Archaic terms included only if they do not conflict with modern usage
3. U.S. spellings are retained when widely adopted in British English (e.g., “movie”) and validated by trusted sources
   • Note: The dictionary's U.S. origins explain why many U.S. words are present.

📥 Installation

1. Firefox/Thunderbird 115+ (ESR): Install directly from Mozilla Add-ons
2. Legacy Firefox/Thunderbird (v59 or earlier):
   • Download the .xpi file from GitHub: https://github.com/marcoagpinto/aoo-mozilla-en-dict
   • Drag & drop the downloaded .xpi file into the Extensions/Dictionaries window
3. Enable via right-click in an editable text area: “Languages” → “English (United Kingdom)”

📚 Full guide: https://proofingtoolgui.org/en_installing.html



🛠 Developer Commitment

• 15+ years of continuous updates
• Personally funded (hosting, Oxford Premium access, domains)
• Open-source collaboration on GitHub
• Built on the Proofing Tool GUI framework for transparent validation

❓ FAQ Highlights

• Why include “movie”? → FAQ #7
• How to report issues → FAQ #4
• View full changelog → https://proofingtoolgui.org/en_GB_CHANGES.txt

🤝 Community-Driven

This project advances thanks to your input:
- Found a missing Oxford/Collins word? → Submit via e-mail or GitHub
- Found a U.S. spelling that should be removed? → Provide dictionary citations
- Having technical issues? → Report via e-mail or GitHub



ℹ Ethical Notes

• No AI or automated scraping – all entries are manually verified
• Archaic terms included cautiously for literary users
• Hosting costs covered privately

This dictionary serves students, professionals, writers, and non-native speakers alike.
Your feedback helps ensure it remains the most reliable free British English resource available.



⚠ NOTICE

I have been publicly criticised for my GB dictionary, even in front of other developers.
They only point out flaws instead of suggesting new words or corrections.

There are millions of words, and I can't manage them all alone.

This project is very serious.
I spend hundreds of EUR yearly on web hosting, domains, and a premium Oxford Dictionaries account so that everyone can enjoy quality work for free.

I am a disabled person and open-source is almost all I have left in life.