diff --git a/docker/xfce-firefox/README-dockerhub.md b/docker/xfce-firefox/README-dockerhub.md
index 77c2d68..5642541 100644
--- a/docker/xfce-firefox/README-dockerhub.md
+++ b/docker/xfce-firefox/README-dockerhub.md
@@ -142,7 +142,7 @@ The main features and components of the images in the default configuration are:
 - current version of [tini][tini] as the entry-point initial process (PID 1)
 - support for overriding both the container user and the group
 - support of **version sticker** (see the [full-length README][this-readme-full] on the **GitHub**)
-- current version of [Firefox][firefox] web browser and some additional **Firefox plus features** described in the [full-length README][this-readme-full] on the GitHub
+- current version of [Firefox ESR (Extended Support Release)][firefox] web browser and some additional **Firefox plus features** described in the [full-length README][this-readme-full] on the GitHub
 
 The history of notable changes is documented in the [CHANGELOG][this-changelog].
 
diff --git a/docker/xfce-firefox/README.md b/docker/xfce-firefox/README.md
index 725bfda..64f0fee 100644
--- a/docker/xfce-firefox/README.md
+++ b/docker/xfce-firefox/README.md
@@ -160,7 +160,7 @@ The main features and components of the images in the default configuration are:
 - current version of [tini][tini] as the entry-point initial process (PID 1)
 - support for overriding both the container user and the group
 - support of **version sticker** (see below)
-- current version of [Firefox][firefox] web browser and some additional **Firefox plus features** described below
+- current version of [Firefox ESR (Extended Support Release)][firefox] web browser and some additional **Firefox plus features** described below
 
 The history of notable changes is documented in the [CHANGELOG][this-changelog].