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Preview of ephemeris

ephemeris by Lysergia

Add a tab-index prefix and bracketed-hostname suffix to every page title.

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About this extension
What It Does

Every page title becomes: tab position, then the page's own title, then the hostname in brackets.

3 Weekly Report [reports.example.com]
  • The 1-based tab position matches Firefox's Alt+1..8 shortcuts, so the title tells you the key that reaches it.
  • The bracketed hostname separates identically-titled pages & feeds title-based window switchers, launchers, & time trackers.
  • The page's own title rides untouched in the middle: never parsed, never truncated, never stripped.

Why It Exists

Running one extension for tab numbers & another for domains-in-titles ends in a rewrite fight: each one's write re-triggers the other, & against a single-page
app that titles its own routes the old pair oscillated dozens of title writes per second. Ephemeris replaces both with a single writer that is immune by
construction:
  • The page always wins: a page-origin title write becomes the new core verbatim.
  • Its own output is never parsed back out of the title, so decorations cannot stack, drift, or accumulate.
  • Exactly two title writes per navigation (the page's & one recomposition), one per tab-index shift, zero at rest - proven by the repository's verification
    harness, not just claimed.

Respectful By Design
  • Zero permissions requested & zero data collection: it reads nothing beyond the page it is decorating & sends nothing anywhere.
  • No options, no toolbar button, no polling: tab events trigger the renumbering & it is idle the rest of the time.
  • Restricted pages (about:, addons.mozilla.org) stay undecorated - Firefox does not run extensions there.

Source, tests, & the title-write verification harness: github.com/prikhi/ephemeris
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Permissions and data

Required permissions:

  • Access your data for all websites

Data collection:

  • The developer says this extension doesn't require data collection.
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Version
1.0.0.1
Size
11 KB
Last updated
6 days ago (Aug 29, 2026)
Related Categories
  • Tabs
License
BSD 3-Clause License
Version History
  • See all versions
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