Add context search for Firefox

Adds configuration for Context Search extension so you can easily
search between OpenStack related sites, proving very usefully if you
inspect the build logs and you don't know where a message comes from
or if there is a bug already created for a specific error message.

Change-Id: I1c9c99fe2cc6b5c71ec8fe8500e40a865232527c

README.md

@@ -26,6 +26,15 @@ or configure it to re-download it when it changes.
 
 - Link codesearch.openstack.org results directly to github.com
 
+## Context search for Firefox
+
+If you often have to search for pieces of OpenStack related code on various
+websites you may find useful to use [Context Search Firefox extension](https://addons.mozilla.org/en-US/firefox/addon/contextual-search/) that
+allows you to perform context searches. You can import the configuration from
+``coats/searchEngines.json``
+
+![coats-log-highlight-example](https://raw.githubusercontent.com/openstack/coats/master/doc/source/_static/img/coats-log-highlight-example.png)
+
 ## Contributing
 
 Before you raise a CR, please run "tox" to perform a sanity check.

cspell.json

@@ -5,6 +5,7 @@
         "TOXENV",
         "atexit",
         "bdist",
+        "bugzilla",
         "conda",
         "deps",
         "envars",
@@ -16,6 +17,7 @@
         "ifeq",
         "ifndef",
         "ifneq",
+        "kibana",
         "noqa",
         "passenv",
         "pycache",