Browser Extension Stores (company-published Firefox add-ons; Chrome Web Store unreadable)

Where this market publishes its structure

• Firefox Add-ons public API v5 search (addons.mozilla.org/api/v5/addons/search/?type=extension&app=firefox) machine-readable, 111,548 of 111,885 read; 53,632 no homepage/support; 23,092 shared host only; 33,915 domain not in catalog; 909 on a catalog domain; 289 providers linked in-market (354 listings), 100 unknown-builder held, 455 failed name check
• AMO addon detail (/api/v5/addons/addon//) machine-readable, same homepage + support_url fields as the search record; used for the 15-link live spot check (15/15 confirmed), not re-read per extension
• Chrome Web Store (chromewebstore.google.com/sitemap) not machine-readable: the only index robots.txt offers (/search disallowed) timed out twice (curl exit 28 at 120 s); detail pages 301 but there is no register to enumerate; platform side would sit on all/google-chrome

Own = declares at least one integration itself; covered = visible only because an aggregator, standards body, regulator or partner contract names it; distribution-only = listed only on cloud marketplaces it sells through, a channel reported beside, never counted as its own declared integrations; undeclared = nothing we can read, so no number; declares_compatibility = providers with a `compatible` shape vote, report only (kin, 2026-10-13): never counted as own, never in depth or position.

Taxonomy how this market maps onto apis.io

Derived 2026-10-22 from the 289 providers in this market we could resolve in the catalog. The percentage is the share of those providers carrying each one; it describes the market, not the tag or industry. Tag groups have no page of their own yet, so they are listed unlinked.

share of resolved cohort carrying it; tags >=0.20 & >=3 members (max 12, junk dropped), tag_groups >=0.20 (cooccurrence, non-cross-cutting; max 8), industries >=0.20 (max 6), areas >=0.10 (max 6; areas are keyword-matched and sparse), capabilities L1 >=0.20 (max 8); derive-market-taxonomy.py

Leaders by position (provisional)

Provisional: grouped by position, depth compared within a position only. Distribution (cloud marketplaces) and iPaaS bridges are counted beside position, never inside it. Unknown-builder listings are left out of position shares and counted here.

undeclared 289 · declares nothing we can read: no number