Add ffize to make Firefox version (#100)

`npm run ff` will build and then make a `public-ff` tree you can load
as a temporary extension in Firefox Quantum.

Also removed old files we no longer need.

.gitignore

@@ -27,7 +27,7 @@ tags
 foo.*
 
 # Output directories
-/public
+/public*
 /build*
 /doc/
 /dist/

ffize.js

@@ -0,0 +1,25 @@
+// ffize.js: Make a Firefox manifest from the built Chrome manifest
+// cxw42, 2018.
+
+var fs = require('fs-extra');
+
+// Copy the whole `public` tree into a fresh `public-ff`.
+fs.removeSync('public-ff');
+fs.copySync('public','public-ff');
+
+// Read the Chrome manifest
+var manifest = require('./public/manifest.json');
+
+// Munge
+delete manifest['version_name'];
+delete manifest['offline_enabled'];
+delete manifest['options_page'];
+delete manifest['background']['persistent'];
+
+var idx = manifest['permissions'].indexOf('chrome://favicon/');
+if(idx > -1) {
+    manifest['permissions'].splice(idx,1);
+}
+
+// Write it back out
+fs.writeFileSync('./public-ff/manifest.json', JSON.stringify(manifest));

package.json

@@ -8,6 +8,7 @@
   },
   "scripts": {
     "build": "npx brunch build",
+    "ff": "sh -c 'npx brunch b ; node ffize.js'",
     "rebuild": "sh -c 'rm -rf public ; npx brunch b ; find public'",
     "debug": "sh -c 'LOGGY_STACKS=1 npx brunch b -d 2>&1 |less -R'",
     "watch": "npx brunch watch",
@@ -60,6 +61,7 @@
     "babel-brunch": "^7.0.0",
     "benchmark": "^2.1.4",
     "brunch": "cxw42/brunch#1527",
+    "fs-extra": "^7.0.1",
     "replacer-brunch": "^1.1.1",
     "sass-brunch": "^2.10.7",
     "seedrandom": "^2.4.3",