readme: extension cookie exceptions

Only `geo.enabled` is covered by RFP, keep the other prefs under 0200 and do some cleanup

- 0202: the /en-US/ in link [2] is necessary for the anchor to work!
- `browser.search.geoip.timeout;1` is unnecessary when `browser.search.geoip.url` is empty string:
https://dxr.mozilla.org/mozilla-central/source/toolkit/components/search/nsSearchService.js#576

README.md

@@ -2,7 +2,7 @@
 A `user.js` is a configuration file that can control hundreds of Firefox settings. For a more technical breakdown and explanation, you can read more on the [overview](https://github.com/ghacksuserjs/ghacks-user.js/wiki/1.1-Overview) wiki page.
 
 ### ![](https://github.com/ghacksuserjs/ghacks-user.js/blob/master/wikipiki/bullet01.png) ghacks user.js
-The [ghacks user.js](https://github.com/ghacksuserjs/ghacks-user.js/blob/master/user.js) is a template, which, as provided, aims (![](https://github.com/ghacksuserjs/ghacks-user.js/blob/master/wikipiki/exclamation.png) with [add-ons](https://github.com/ghacksuserjs/ghacks-user.js/wiki/Appendix-B:-Firefox-Add-ons) <sup>1</sup> ) to provide as much privacy and enhanced security as possible, and to reduce tracking and fingerprinting as much as possible - while minimizing any loss of functionality and breakage (but it will happen).
+The [ghacks user.js](https://github.com/ghacksuserjs/ghacks-user.js/blob/master/user.js) is a template, which, as provided, aims (![](https://github.com/ghacksuserjs/ghacks-user.js/blob/master/wikipiki/exclamation.png) with [extensions](https://github.com/ghacksuserjs/ghacks-user.js/wiki/Appendix-B:-Extensions) <sup>1</sup> ) to provide as much privacy and enhanced security as possible, and to reduce tracking and fingerprinting as much as possible - while minimizing any loss of functionality and breakage (but it will happen).
 
 We aim to INFORM and give you CHOICES. No one size fits all, so customize it! And not all sites have the same requirements, so use [profiles](https://github.com/ghacksuserjs/ghacks-user.js/wiki/2.3-Concurrent-Profiles) with custom versions. We won't set you wrong.
 
@@ -16,7 +16,7 @@ INFORMATION IS POWER. So you can make informed decisions to better protect yours
 * Current and up-to-date with stable (including [changelogs](https://github.com/ghacksuserjs/ghacks-user.js/search?q=label%3Achangelog&type=Issues&utf8=%E2%9C%93))
 * Detailed (preference versioning, hidden preference information, explanations, and more)
 * Easy to use and discuss (sections, sub-sections, numbering)
-* Helpful (including a [wiki](https://github.com/ghacksuserjs/ghacks-user.js/wiki) with features such as [add-ons](https://github.com/ghacksuserjs/ghacks-user.js/wiki/Appendix-B:-Firefox-Add-ons), [user scripts](https://github.com/ghacksuserjs/ghacks-user.js/wiki/3.1-User-Scripts), [references](https://github.com/ghacksuserjs/ghacks-user.js/wiki/Appendix-D:-References) and more)
+* Helpful (including a [wiki](https://github.com/ghacksuserjs/ghacks-user.js/wiki) with features such as [extensions](https://github.com/ghacksuserjs/ghacks-user.js/wiki/Appendix-B:-Extensions), [user scripts](https://github.com/ghacksuserjs/ghacks-user.js/wiki/3.1-User-Scripts), [references](https://github.com/ghacksuserjs/ghacks-user.js/wiki/Appendix-D:-References) and more)
 * Innovative (formatting, special tags, and future plans such as branches)
 
 ### ![](https://github.com/ghacksuserjs/ghacks-user.js/blob/master/wikipiki/bullet01.png) usage
@@ -26,7 +26,7 @@ Everyone, experts included, should at least read the [implementation](https://gi
 Literally thousands of sources, references and suggestions. That said...
 
 * Martin Brinkmann at [ghacks](https://www.ghacks.net/) <sup>2</sup>
-   * 100% genuine super-nice all-round good guy
+   * 100% genuine super-nice all-around good guy
 * The ghacks community and commentators
    * Special mentions to [earthlng](https://github.com/earthlng), Tom Hawack, Just me, Conker, Rockin’ Jerry, Ainatar, Parker Lewis
 * [12bytes](http://12bytes.org/articles/tech/firefoxgecko-configuration-guide-for-privacy-and-performance-buffs)