diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4e96bec66..0e2fd9c74 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,9 +1,10 @@
 # CHANGELOG - sitespeed.io
 
-##  15.9.0 - UNRELASED
+##  15.9.0 - 2020-11-18
 ### Added
 * Updated to Chrome 87 in the Docker container
 * Updated to latest Browsertime with Chromedriver 87.
+* Added latest Browsertime [10.9.0](https://github.com/sitespeedio/browsertime/releases/tag/v10.9.0) with fixes for Firefox.
 
 ## 15.8.0 - 2020-11-17
 ### Added 
diff --git a/docs/_includes/version/browsertime.txt b/docs/_includes/version/browsertime.txt
index 92c823638..e3cbcda79 100644
--- a/docs/_includes/version/browsertime.txt
+++ b/docs/_includes/version/browsertime.txt
@@ -1 +1 @@
-10.8.0
\ No newline at end of file
+10.9.0
\ No newline at end of file
diff --git a/docs/documentation/browsertime/configuration/config.md b/docs/documentation/browsertime/configuration/config.md
index 7826a766e..3bab9996c 100644
--- a/docs/documentation/browsertime/configuration/config.md
+++ b/docs/documentation/browsertime/configuration/config.md
@@ -37,6 +37,7 @@ chrome
 firefox
   --firefox.binaryPath                      Path to custom Firefox binary (e.g. Firefox Nightly). On OS X, the path should be to the binary inside the app bundle, e.g. /Applications/Firefox.app/Contents/MacOS/firefox-bin
   --firefox.geckodriverPath                 Path to custom geckodriver binary. Make sure to use a geckodriver version that's compatible with the version of Firefox (Gecko) you're using
+  --firefox.geckodriverArgs                 Flags passed in to Geckodriver see https://firefox-source-docs.mozilla.org/testing/geckodriver/Flags.html. Use it like --firefox.geckodriverArgs="--marionette-port"  --firefox.geckodriverArgs=1027  [string]
   --firefox.nightly                         Use Firefox Nightly. Works on OS X. For Linux you need to set the binary path.  [boolean]
   --firefox.beta                            Use Firefox Beta. Works on OS X. For Linux you need to set the binary path.  [boolean]
   --firefox.developer                       Use Firefox Developer. Works on OS X. For Linux you need to set the binary path.  [boolean]
diff --git a/npm-shrinkwrap.json b/npm-shrinkwrap.json
index bf0aa30cc..8ac9113bc 100644
--- a/npm-shrinkwrap.json
+++ b/npm-shrinkwrap.json
@@ -1136,9 +1136,9 @@
       }
     },
     "browsertime": {
-      "version": "10.8.0",
-      "resolved": "https://registry.npmjs.org/browsertime/-/browsertime-10.8.0.tgz",
-      "integrity": "sha512-bkZvrdcF80qjV74KjKhB5TyqOqwvCmAmW4N96PzxIGdPa/BqIsuJTa3sQZE+2zuiF7IfJS97HkP1+9NPeyK9qg==",
+      "version": "10.9.0",
+      "resolved": "https://registry.npmjs.org/browsertime/-/browsertime-10.9.0.tgz",
+      "integrity": "sha512-ungRPRy6tJh6KizLwMUS7kJHRVlc1Gf1/3qNmKCtjVgSjeNf3SknWozMa1TEd7nj/cHWsFdJmamamXuW5t4dVQ==",
       "requires": {
         "@cypress/xvfb": "1.2.4",
         "@sitespeed.io/chromedriver": "87.0.4280-20",
diff --git a/package.json b/package.json
index 7071eed5e..4fdcaa3f5 100644
--- a/package.json
+++ b/package.json
@@ -73,7 +73,7 @@
     "@tgwf/co2": "0.6.1",
     "aws-sdk": "2.784.0",
     "axe-core": "4.0.2",
-    "browsertime": "10.8.0",
+    "browsertime": "10.9.0",
     "coach-core": "5.1.1",
     "cli-color": "2.0.0",
     "concurrent-queue": "7.0.2",