NATURE SWAP for FIREFOX (version 140 or newer)
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Firefox only installs add-ons permanently when Mozilla has signed them. You have three options:

A) TRY IT RIGHT NOW (temporary: removed when Firefox restarts)
   1. Open  about:debugging#/runtime/this-firefox
   2. Click "Load Temporary Add-on…" and pick manifest.json inside the unzipped nature-swap folder
      (or pick the .zip itself).
   3. Click the puzzle-piece icon in the toolbar → Nature Swap → "Always allow on all websites"
      (or use the "Allow on all websites" button in the Nature Swap popup).

B) KEEP IT PERMANENTLY, FREE (Mozilla signs it for your own use; takes about 5 minutes)
   1. Sign in at https://addons.mozilla.org/developers/ (a free Firefox account).
   2. Choose "Submit a New Add-on" → "On your own" (self-distribution, not listed publicly).
   3. Upload nature-swap-firefox.zip. It's validated and signed automatically, usually within minutes.
   4. Download the signed .xpi and drag it onto any Firefox window → Add.
   Pick "On this site" (listed) instead if you want it public on the Firefox Add-ons store.

C) FIREFOX DEVELOPER EDITION / NIGHTLY / ESR
   Set  xpinstall.signatures.required = false  in about:config, then install the zip from
   about:addons → gear icon → "Install Add-on From File…".

After installing, open the Nature Swap popup once. If it says Firefox needs your OK, click
"Allow on all websites". Firefox treats website access as a separate permission.

Everything else works the same as in Chrome: pick Everything or Ads only, set images/videos/ads
to Replace, Hide or Show, choose theme packs or make your own (your photos never leave your browser), whitelist sites or pages from the toolbar popup,
right-click → "Show the original here", Alt+Shift+N pauses the tab, and Alt+Shift+W whitelists
the site. To change the shortcuts, open about:addons → gear icon → Manage Extension Shortcuts.
