Prototype Pollution introduced due to vulnerable minimist version

Nobody has claimed this yet.

`npm audit` reports the following:

```

=== npm audit security report ===

┌──────────────────────────────────────────────────────────────────────────────┐
│ Manual Review │
│ Some vulnerabilities require your attention to resolve │
│ │
│ Visit https://go.npm.me/audit-guide for additional guidance │
└──────────────────────────────────────────────────────────────────────────────┘
┌───────────────┬──────────────────────────────────────────────────────────────┐
│ Low │ Prototype Pollution │
├───────────────┼──────────────────────────────────────────────────────────────┤
│ Package │ minimist │
├───────────────┼──────────────────────────────────────────────────────────────┤
│ Patched in │ >=0.2.1 <1.0.0 || >=1.2.3 │
├───────────────┼──────────────────────────────────────────────────────────────┤
│ Dependency of │ @wext/shipit [dev] │
├───────────────┼──────────────────────────────────────────────────────────────┤
│ Path │ @wext/shipit > web-ext > chrome-launcher > mkdirp > minimist │
├───────────────┼──────────────────────────────────────────────────────────────┤
│ More info │ https://npmjs.com/advisories/1179 │
└───────────────┴──────────────────────────────────────────────────────────────┘
┌───────────────┬──────────────────────────────────────────────────────────────┐
│ Low │ Prototype Pollution │
├───────────────┼──────────────────────────────────────────────────────────────┤
│ Package │ minimist │
├───────────────┼──────────────────────────────────────────────────────────────┤
│ Patched in │ >=0.2.1 <1.0.0 || >=1.2.3 │
├───────────────┼──────────────────────────────────────────────────────────────┤
│ Dependency of │ @wext/shipit [dev] │
├───────────────┼──────────────────────────────────────────────────────────────┤
│ Path │ @wext/shipit > web-ext > mkdirp > minimist │
├───────────────┼──────────────────────────────────────────────────────────────┤
│ More info │ https://npmjs.com/advisories/1179 │
└───────────────┴──────────────────────────────────────────────────────────────┘
found 2 low severity vulnerabilities in 13241 scanned packages
2 vulnerabilities require manual review. See the full report for details.
```

This is caused by depending on an old version of web-ext. Unfortunately, a newer web-ext version is not yet released (but fixed in their master).

Start with the npm audit report and trace the listed minimist paths through web-ext, chrome-launcher, mkdirp, and @wext/shipit. Check the current web-ext dependency and its upstream master fix; done means the dependency tree uses a patched minimist version and npm audit no longer reports these vulnerabilities.

Written by the indexing model from the issue text.