diff --git a/.config/setup.sh b/.config/setup.sh
index 9baadad..afab788 100755
--- a/.config/setup.sh
+++ b/.config/setup.sh
@@ -96,3 +96,7 @@ git clone https://github.com/tmux-plugins/tpm ~/.tmux/plugins/tpm
 
 ## Install powerlevel10k
 git clone --depth=1 https://github.com/romkatv/powerlevel10k.git ${ZSH_CUSTOM:-$HOME/.oh-my-zsh/custom}/themes/powerlevel10k
+
+## Setup userchromecss
+cd ~/.mozilla/firefox && ls | grep default | xargs -I '{}' ln -s $PWD/chrome '{}'/chrome
+cd ~
diff --git a/.mozilla/firefox/add.svg b/.mozilla/firefox/chrome/add.svg
similarity index 100%
rename from .mozilla/firefox/add.svg
rename to .mozilla/firefox/chrome/add.svg
diff --git a/.mozilla/firefox/left-arrow.svg b/.mozilla/firefox/chrome/left-arrow.svg
similarity index 100%
rename from .mozilla/firefox/left-arrow.svg
rename to .mozilla/firefox/chrome/left-arrow.svg
diff --git a/.mozilla/firefox/right-arrow.svg b/.mozilla/firefox/chrome/right-arrow.svg
similarity index 100%
rename from .mozilla/firefox/right-arrow.svg
rename to .mozilla/firefox/chrome/right-arrow.svg
diff --git a/.mozilla/firefox/chrome/rotate-right-solid.svg b/.mozilla/firefox/chrome/rotate-right-solid.svg
new file mode 100644
index 0000000..5ef7a1b
--- /dev/null
+++ b/.mozilla/firefox/chrome/rotate-right-solid.svg
@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512"><!--! Font Awesome Pro 6.2.0 by @fontawesome - https://fontawesome.com License - https://fontawesome.com/license (Commercial License) Copyright 2022 Fonticons, Inc. --><path d="M463.5 224H472c13.3 0 24-10.7 24-24V72c0-9.7-5.8-18.5-14.8-22.2s-19.3-1.7-26.2 5.2L413.4 96.6c-87.6-86.5-228.7-86.2-315.8 1c-87.5 87.5-87.5 229.3 0 316.8s229.3 87.5 316.8 0c12.5-12.5 12.5-32.8 0-45.3s-32.8-12.5-45.3 0c-62.5 62.5-163.8 62.5-226.3 0s-62.5-163.8 0-226.3c62.2-62.2 162.7-62.5 225.3-1L327 183c-6.9 6.9-8.9 17.2-5.2 26.2s12.5 14.8 22.2 14.8H463.5z"/></svg>
\ No newline at end of file
diff --git a/.mozilla/firefox/userChrome.css b/.mozilla/firefox/chrome/userChrome.css
similarity index 84%
rename from .mozilla/firefox/userChrome.css
rename to .mozilla/firefox/chrome/userChrome.css
index 100fbf1..fe72f06 100644
--- a/.mozilla/firefox/userChrome.css
+++ b/.mozilla/firefox/chrome/userChrome.css
@@ -25,6 +25,8 @@
   --mff-urlbar-results-font-size: 12pt;
   --mff-urlbar-results-font-weight: 700;
   --mff-urlbar-results-url-color: #81A1C1;
+  
+  --mff-menu-background: #32373b;
   /*   --mff-tab-selected-bg: linear-gradient(90deg, rgba(232,74,95,1) 0%, rgba(255,132,124,1) 50%, rgba(254,206,168,1) 100%); */
   /*   --mff-urlbar-font-weight: 600; */
 
@@ -736,3 +738,76 @@ tree,
 .tab-container[pinned] {
     width: 50px !important;
 }
+
+menupopup:not(.in-menulist) > menuitem, 
+menupopup:not(.in-menulist) > menu {
+  padding-block: 4px !important; /* reduce to 3px, 2px, 1px or 0px as needed */ 
+  min-height: unset !important; /* v92.0 - for padding below 4px */
+}
+:root {
+  --arrowpanel-menuitem-padding: 4px 8px !important;
+}
+
+/* Bookmarks Toolbar folders */
+#PersonalToolbar menupopup,
+/* Right-click context menus */
+#mainPopupSet menupopup,
+/* Top menu bar on Windows (not sure about others) */
+#toolbar-menubar menupopup,
+/* Sidebar/Library bookmark/history context menus */
+#placesContext,
+/* Address bar context menu/* Bookmarks Toolbar folders */
+#PersonalToolbar menupopup,
+/* Right-click context menus */
+#mainPopupSet menupopup,
+/* Top menu bar on Windows (not sure about others) */
+#toolbar-menubar menupopup,
+/* Sidebar/Library bookmark/history context menus */
+#placesContext,
+/* Address bar context menu (2021-10-25) */
+#urlbar-input-container menupopup,
+/* Various toolbar drop-down panels (Fx96) */
+#back-button menupopup, #forward-button menupopup,
+#identity-popup, #appMenu-popup, #downloadsPanel, #BMB_bookmarksPopup {
+  /* Text color */
+  --menu-color: #fff !important;
+  --arrowpanel-color: #fff !important;
+  --panel-color: #fff !important;
+  /* Background color */
+  --menu-background-color: var(--mff-menu-background) !important;
+  --arrowpanel-background: var(--mff-menu-background) !important;
+  --panel-background: var(--mff-menu-background) !important;
+  /* Border color (if any) */
+  --menu-border-color: threedshadow !important;
+  --arrowpanel-border-color: threedshadow !important;
+  --panel-border-color: threedshadow !important;
+  /* Hovered/expanded item background color */
+  --menuitem-hover-background-color: #e0e0e6 !important;
+  --button-hover-bgcolor: #e0e0e6 !important;
+  /* Disabled items text color and hovered background */
+  --menu-disabled-color: rgba(21, 20, 26, 0.4) !important;
+  --menuitem-disabled-hover-background-color: rgba(224, 224, 230, 0.4) !important;
+} (2021-10-25) */
+#urlbar-input-container menupopup,
+/* Various toolbar drop-down panels (Fx96) */
+#back-button menupopup, #forward-button menupopup,
+#identity-popup, #appMenu-popup, #downloadsPanel, #BMB_bookmarksPopup {
+  /* Text color */
+  --menu-color: #000 !important;
+  --arrowpanel-color: #000 !important;
+  --panel-color: #000 !important;
+  /* Background color */
+  --menu-background-color:  #f0f0f0 !important;
+  --arrowpanel-background: #f0f0f0 !important;
+  --panel-background: #f0f0f0 !important;
+  /* Border color (if any) */
+  --menu-border-color: threedshadow !important;
+  --arrowpanel-border-color: threedshadow !important;
+  --panel-border-color: threedshadow !important;
+  /* Hovered/expanded item background color */
+  --menuitem-hover-background-color: #e0e0e6 !important;
+  --button-hover-bgcolor: #e0e0e6 !important;
+  /* Disabled items text color and hovered background */
+  --menu-disabled-color: rgba(21, 20, 26, 0.4) !important;
+  --menuitem-disabled-hover-background-color: rgba(224, 224, 230, 0.4) !important;
+}
\ No newline at end of file
diff --git a/.mozilla/firefox/chrome/xmark-solid.svg b/.mozilla/firefox/chrome/xmark-solid.svg
new file mode 100644
index 0000000..22d0dda
--- /dev/null
+++ b/.mozilla/firefox/chrome/xmark-solid.svg
@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 320 512"><!--! Font Awesome Pro 6.2.0 by @fontawesome - https://fontawesome.com License - https://fontawesome.com/license (Commercial License) Copyright 2022 Fonticons, Inc. --><path d="M310.6 150.6c12.5-12.5 12.5-32.8 0-45.3s-32.8-12.5-45.3 0L160 210.7 54.6 105.4c-12.5-12.5-32.8-12.5-45.3 0s-12.5 32.8 0 45.3L114.7 256 9.4 361.4c-12.5 12.5-12.5 32.8 0 45.3s32.8 12.5 45.3 0L160 301.3 265.4 406.6c12.5 12.5 32.8 12.5 45.3 0s12.5-32.8 0-45.3L205.3 256 310.6 150.6z"/></svg>
\ No newline at end of file
diff --git a/README.md b/README.md
index 5907ccf..a149d7f 100644
--- a/README.md
+++ b/README.md
@@ -128,3 +128,11 @@ Some machines, lacking discrete or recent GPU, will not be able to start Alacrit
 Updated as of [this commit](https://github.com/TanguyHerbron/dotfiles/commit/9adabddf70494ba534bcc5dd94260a92e1c996c3)
 
 `#0F1419,#1F2430,#73D0FF,#1F2430,#1F2430,#D9D7CE,#BAE67E,#FF6666,#1F2430,#FFFFFF`
+
+### Debugger for Firefox userChrome.css modification
+- F12 or Ctrl+Shift+c menu
+- Three dots > Cog icon
+- Check "Enable browser chrome and add-on debugging toolboxes" and "Enable remote debugging"
+- Ctrl+Shift+Alt+I and confirm security prompt
+#### Live edit
+- Style editor > userChrome.css