Blackfyre — MG—01 · Firefox / Zen theme

Firefox / Zen, temporary (until restart):
  about:debugging#/runtime/this-firefox → Load Temporary Add-on → manifest.json

Permanent: zip the folder contents (manifest.json at zip root) and either
  - submit at addons.mozilla.org as unlisted to get it signed, or
  - Zen/Firefox Dev/Nightly: about:config → xpinstall.signatures.required = false,
    rename the zip to blackfyre.xpi, open it in the browser.

Zen extras (about:config), so Zen's own accents match:
  zen.theme.accent-color      = #e2551d
  zen.theme.color-prefs.use-workspace-colors = false   (if you want the theme, not workspace tints)
  zen.view.grey-out-inactive-windows = false            (keeps the frame #1b1b19 when unfocused)

Frame/sidebar #1b1b19 · toolbar/popups #242421 · text #f3f2ee · icons #a19e96
Accent (tab line, focus ring, highlights, attention) #e2551d