Viska

Email proofreading that stays under your control.

Viska Brev proofreads Swedish and English drafts directly in Thunderbird. Use Ollama Server, Ollama Cloud, OpenRouter, or SGLang with your chosen model.

Download .xpi Install steps

Latest build: 0.4.6 for Thunderbird 128+.

New in 0.4.6: DeepSeek V4.1 Flash through Ollama Cloud is the recommended cloud model, which Ollama states does not log or train on prompts and responses.

Ollama Server + Cloud OpenRouter + SGLang Diff preview GPL-3.0-only

Clean up the draft, not your voice.

The extension opens a proofreading panel in Thunderbird's compose window. Choose spelling, grammar or expand mode, review the green/red diff, then accept only when the result is right. Quoted mail and signatures are left alone.

Spelling Grammar Expand Language auto-detect Protected quotes Protected signatures
Viska Brev plugin in Thunderbird compose window: real diff highlighting with red deletions and green insertions, change count, Ersätt and Förkasta buttons.

Install from the XPI file.

Viska Brev is self-hosted for now. Thunderbird can install unsigned extensions from a local file, so the XPI works without Add-ons store publishing.

viska-brev-latest.xpi viska-brev-0.4.6.xpi
Version
0.4.6
Size
57 KB
Requires
Thunderbird 128+
SHA256
63e094e9066e2bada8f807cf182309b8412344b7565c70b43a20850d1da064d0

Install once, then update in Thunderbird.

The first installation is from the XPI file. Version 0.4.3 and later then use Viska Brev's secure update feed inside Thunderbird. Verify the checksum in downloads/SHA256SUMS if needed. Configure and test Ollama Server, Ollama Cloud, OpenRouter, or SGLang in the extension's Connections settings. 

1. Download viska-brev-latest.xpi
2. Thunderbird -> Tools -> Add-ons and Themes
3. Gear menu -> Install Add-on From File
4. Select the .xpi file

Updates after 0.4.3:
Add-ons and Themes -> Gear menu -> Check for Updates
Keep automatic add-on updates enabled.

Already installed before 0.4.3? Install this XPI over it once.
Do not uninstall: removing it can clear provider settings and prompts.

Local Ollama: allow OLLAMA_ORIGINS=moz-extension://*

Connections:
Choose a provider, model, and optional/required key
Use Test connection before proofreading

Natural Thunderbird paragraph spacing on Linux.

Grammar and Expanded now use semantic Thunderbird paragraphs, so dictated Linux drafts keep natural spacing without empty double rows. Rich links, lists, quotes and signatures stay protected, with a clear localized choice only when plain replacement is needed.

Recent development.

  1. Viska Brev 0.4.5

    Restores natural Thunderbird paragraph spacing for model-created greetings, body text and closings on Linux.

  2. Viska Brev 0.4.4

    Turns model paragraph markers into standard Thunderbird paragraphs without adding unintended empty rows.

  3. Viska Brev 0.4.3

    Adds secure in-place updates and safe paragraph reflow for ordinary Thunderbird email drafts.

  4. Viska Brev 0.4.2

    Makes connection tests clearer and strengthens email-aware paragraph formatting for dictated drafts.

  5. Viska Brev 0.4.1

    Fixes settings migration from 0.3.1 while preserving provider, model, prompt and privacy choices.

  6. Viska Brev 0.4.0

    Adds Ollama Server, Ollama Cloud, OpenRouter and SGLang, with reliable provider streams and safe retries.

  7. Viska Brev 0.3.1

    Adds support for Ollama servers on the local network, not only localhost.

  8. Viska Brev 0.3.0

    Introduces Viska Brev, its dedicated landing page and self-hosted Thunderbird download.

Full changelog (all versions)