Merge pull request #120 from ikkitaguchi/remove_non_existing_mozilla_addons

Removed non existing Firefox addons

README.md

@@ -974,7 +974,6 @@ Thanks to our main contributors
 * [Reader IQ](http://www.ereaderiq.com)
 * [Readgeek](http://www.readgeek.com)
 * [Riffle](https://www.rifflebooks.com)
-* [SendtoKindle](https://addons.mozilla.org/en-US/firefox/addon/sendtokindle/?src=search)
 * [Shelfie](http://www.shelfie.com)
 * [TasteKid: Books](http://www.tastekid.com/books)
 * [TheBooksProject](http://thebooksproject.co)
@@ -1212,7 +1211,6 @@ Thanks to our main contributors
 
 ## [↑](#contents) Web Monitoring
 
-* [AlertBox](https://addons.mozilla.org/en-US/firefox/addon/alertbox)
 * [Alltop](http://alltop.com)
 * [Awasu](http://www.awasu.com)
 * [Bridge.Leslibres](https://bridge.leslibres.org)
@@ -1248,7 +1246,6 @@ Thanks to our main contributors
 * [RSS Search Hub](http://www.rsssearchhub.com)
 * [RSSOwl](http://www.rssowl.org)
 * [RSS Subscription Extension](https://chrome.google.com/webstore/detail/rss-subscription-extensio/bmjffnfcokiodbeiamclanljnaheeoke?hl=en)
-* [Sage](https://addons.mozilla.org/en-US/firefox/addon/sage/?src=search)
 * [Selfoss](http://selfoss.aditu.de)
 * [Silobreaker](http://www.silobreaker.com)
 * [Talkwalker](http://www.talkwalker.com)
@@ -1294,7 +1291,6 @@ Thanks to our main contributors
 * [Raindrop](https://raindrop.io)
 * [Refind](https://refind.com)
 * [Scoop.it](http://www.scoop.it)
-* [Scrapbook](https://addons.mozilla.org/en-US/firefox/addon/scrapbook)
 * [Scrible](http://www.scrible.com)
 * [Sitehoover](http://www.sitehoover.com)
 * [Spaaze](http://www.spaaze.com)
@@ -1647,7 +1643,7 @@ Thanks to our main contributors
 * [Focus booster](https://www.focusboosterapp.com)
 * [Freecamp](https://freedcamp.com)
 * [Good night Chrome](http://www.goodnightchrome.com)
-* [Leechblock](https://addons.mozilla.org/en-US/firefox/addon/leechblock)
+* [Leechblock NG](https://addons.mozilla.org/en-US/firefox/addon/leechblock-ng)
 * [MorningRoutine](http://www.ubicolor.com/morningroutine.html)
 * [MyLifeOrganized](http://www.mylifeorganized.net)
 * [Pintask](https://pintask.me)
@@ -1677,7 +1673,6 @@ Thanks to our main contributors
 * [AutoHotkey](https://www.autohotkey.com)
 * [Batched Inbox](https://www.batchedinbox.com)
 * [Baydin](https://www.baydin.com)
-* [BetterGmail](https://addons.mozilla.org/en-US/firefox/addon/better-gmail-2/)
 * [Block Sender](https://chrome.google.com/webstore/detail/block-sender/bklnjbfcmglhiaoppcckdodanccbelcg)
 * [Boomerang Mail](http://www.boomeranggmail.com)
 * [ClearContext](http://www.clearcontext.com)
@@ -1686,7 +1681,6 @@ Thanks to our main contributors
 * [Complete](https://complete.li)
 * [FindBigMail](https://www.findbigmail.com)
 * [Followupthen](https://www.followupthen.com)
-* [Gpum](https://addons.mozilla.org/en-US/firefox/addon/gpum)
 * [Hiver](http://hiverhq.com)
 * [Integrated gmail](https://addons.mozilla.org/en-US/firefox/addon/integrated-gmail)
 * [Mailstore](http://www.mailstore.com)
@@ -2109,12 +2103,9 @@ Thanks to our main contributors
 * [AdblockPlus](https://adblockplus.org)
 * [Adium](https://adium.im)
 * [Axcrypt](http://www.axantum.com/axcrypt)
-* [Blender](https://addons.mozilla.org/en-US/firefox/addon/blender-1)
 * [boxcryptor](https://www.boxcryptor.com)
 * [CCleaner](https://www.piriform.com/ccleaner)
 * [Chatsecure](https://chatsecure.org)
-* [ClearConsole](https://addons.mozilla.org/en-US/firefox/addon/clear-console)
-* [Click&Clean](https://addons.mozilla.org/en-US/firefox/addon/clickclean)
 * [Disconnect](https://disconnect.me)
 * [Do Not Track](http://donottrack.us)
 * [Duck Duck Go Search Engine](https://duckduckgo.com)