ephemeris by Lysergia
Add a tab-index prefix and bracketed-hostname suffix to every page title.
Extension Metadata
About this extension
What It Does
Every page title becomes: tab position, then the page's own title, then the hostname in brackets.
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:
Respectful By Design
Source, tests, & the title-write verification harness: github.com/prikhi/ephemeris
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.
More information
- Add-on Links
- Version
- 1.0.0.1
- Size
- 11 KB
- Last updated
- 6 days ago (Aug 29, 2026)
- Related Categories
- License
- BSD 3-Clause License
- Version History
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