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MozillaLive fetcher

Mozilla-Tabstack

Mozilla-Tabstack is an agent for Tabstack, Mozilla’s developer platform for programmatic, AI-driven interaction with web content.

Reads a page when a person asks for it.

Get the robots.txt ruleMozilla documentation
Is Mozilla-Tabstack allowed on your site?
  • Mozilla-TabstackUser fetch
    Not checked

Reads your live robots.txt and applies the same rules these crawlers use. Nothing is stored.

robots.txt token
Mozilla-Tabstack
Follows robots.txt
Not always
How to verify it
Not published
Seen on
Not measured
Last checked
17 September 2026

Should you block Mozilla-Tabstack?

Usually not. It reads a page only when a person asks about it, so blocking it hides your page from someone already looking for it.

About robots.txtTabstack’s documentation says it respects robots.txt directives explicitly addressed to its user-agent. It does not say whether it follows rules written only for User-agent: *.

robots.txt
User-agent: Mozilla-Tabstack
Disallow: /

Asks Mozilla-Tabstack not to crawl any page. Add it to the robots.txt file at the root of your site, above any wider rules.

Ignored robots.txt?

Spot it in your logs.

Match the name, then check where the request came from. Anyone can copy a user-agent.

User-agentsource
Mozilla-Tabstack/1.0 (+https://tabstack.ai)

Version numbers change. Match the highlighted name, not the whole string.

  1. 1

    Match the name

    Search your server or CDN log for Mozilla-Tabstack, case-insensitive. A match is a clue, not proof.

  2. 2

    Check the source

    Mozilla publishes no IP ranges, reverse DNS or signatures for Mozilla-Tabstack in the sources here, so it cannot be verified. Treat matches as unconfirmed.

Serve the content in HTML

The cited operator material does not verify JavaScript rendering. Serve useful HTML before client-side JavaScript where possible.

Questions, answered.

Mozilla-Tabstack is an agent for Tabstack, Mozilla's developer platform for programmatic, AI-driven interaction with web content.

Sources.

Officially documented. Operator facts and Trakkr’s measurements keep separate dates.

  1. [1]
    Mozilla crawler documentation

    Officially documented · checked 17 September 2026

    docs.tabstack.ai/trust/controlling-access/

First verified 17 September 2026. Last source check 17 September 2026.

All AI crawlers

See which AI crawlers read your site.

Trakkr shows which bots, Mozilla-Tabstack included, visit which pages each day, and whether the answers they feed mention you.

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