diff --git a/firefox/treestyletab.json b/firefox/treestyletab.json
new file mode 100644
index 0000000..0b0cb68
--- /dev/null
+++ b/firefox/treestyletab.json
@@ -0,0 +1,36 @@
+{
+  "__ConfigsMigration__userValeusSameToDefaultAreCleared": true,
+  "animation": false,
+  "autoAttach": false,
+  "autoAttachOnDuplicated": 0,
+  "autoAttachOnNewTabButtonMiddleClick": 0,
+  "autoAttachOnNewTabCommand": 0,
+  "autoAttachOnOpenedFromExternal": 0,
+  "autoAttachSameSiteOrphan": 0,
+  "autoGroupNewTabsFromPinned": false,
+  "chunkedUserStyleRules0": "OnJvb3Quc2lkZWJhciB0YWItaXRlbSB7CiAgZm9udC1zaXplOiA5cHggIWltcG9ydGFudDsKfQoKLyogU2hvdyB0aXRsZSBvZiB1bnJlYWQgdGFicyB3aXRoIHJlZCBhbmQgaXRhbGljIGZvbnQgKi8KLyoKOnJvb3Quc2lkZWJhciB0YWItaXRlbS51bnJlYWQgLmxhYmVsLWNvbnRlbnQgewogIGNvbG9yOiByZWQgIWltcG9ydGFudDsKICBmb250LXN0eWxlOiBpdGFsaWMgIWltcG9ydGFudDsKfQoqLwoKLyogQWRkIHByaXZhdGUgYnJvd3NpbmcgaW5kaWNhdG9yIHBlciB0YWIgKi8KLyoKOnJvb3Quc2lkZWJhciB0YWItaXRlbS5wcml2YXRlLWJyb3dzaW5nIHRhYi1sYWJlbDpiZWZvcmUgewogIGNvbnRlbnQ6ICLwn5W2IjsKfQoqLw==",
+  "configsVersion": 26,
+  "insertNewChildAt": 3,
+  "notifiedFeaturesVersion": 9,
+  "optionsExpandedGroups": [
+    "group-allConfigs"
+  ],
+  "optionsExpandedSections": [
+    "section-appearance",
+    "section-advanced",
+    "section-newTabWithOwner",
+    "section-newTab",
+    "section-treeBehavior",
+    "section-contextMenu",
+    "section-drag",
+    "section-addons",
+    "section-debug"
+  ],
+  "showExpertOptions": true,
+  "sidebarPosition": 1,
+  "sidebarPositionRighsideNotificationShown": true,
+  "syncParentTabAndOpenerTab": false,
+  "userStyleRules": "",
+  "userStyleRulesFieldHeight": "153.3333282470703px",
+  "warnOnCloseTabsByClosebox": false
+}
diff --git a/firefox/userChrome.css b/firefox/userChrome.css
new file mode 100644
index 0000000..2f547e5
--- /dev/null
+++ b/firefox/userChrome.css
@@ -0,0 +1,67 @@
+/*
+  about:support > Profile Folder > Open Directory
+  https://firefox-source-docs.mozilla.org/devtools-user/settings/index.html
+  open Developer settings; select "Enable browser chrome and add-on debugging toolboxes" and "Enable remote debugging"
+*/
+
+:root {
+  --tab-min-height: 0 !important;
+}
+
+#tabs-newtab-button {
+  visibility: collapse !important;
+}
+
+.tabbrowser-tab {
+  visibility: collapse;
+}
+
+#titlebar {
+  margin-top: -8px;
+}
+
+#titlebar-spacer {
+  background-color: var(--chrome-secondary-background-color);
+}
+
+.titlebar-button {
+  height: 27px !important;
+}
+
+.titlebar-buttonbox-container {
+  margin-bottom: -10.5px;
+  margin-top: 4px;
+  margin-right: 5px;
+}
+
+.titlebar-color {
+  background-color: var(--toolbar-bgcolor);
+}
+
+#nav-bar {
+  box-shadow: none !important;
+  opacity: 0;
+  height: 0;
+  min-height: 5px !important;
+}
+
+#nav-bar:hover {
+  opacity: 1;
+  height: initial;
+  min-height: 20px !important;
+}
+
+#nav-bar:hover #urlbar[breakout] {
+  /* #nav-bar min-height changes the default; we must restore it once hovered */
+  /* see: https://github.com/WesleyBranton/Remove-Firefox-Megabar/blob/master/remove_megabar.css */
+  /* see: https://www.userchrome.org/megabar-styling-firefox-address-bar.html */
+  --urlbar-toolbar-height: 40px !important;
+}
+
+#sidebar-box {
+  font-size: 12px !important;
+}
+
+#sidebar-box #sidebar-header {
+  font-size: 12px !important;
+}
diff --git a/firefox/vimium.json b/firefox/vimium.json
new file mode 100644
index 0000000..5b1e156
--- /dev/null
+++ b/firefox/vimium.json
@@ -0,0 +1,21 @@
+{
+  "settingsVersion": "1.67.1",
+  "exclusionRules": [],
+  "filterLinkHints": false,
+  "waitForEnterForFilteredHints": true,
+  "hideHud": false,
+  "keyMappings": "# Insert your preferred key mappings here.\nunmap d\nunmap u\nmap <c-d> scrollPageDown\nmap <c-u> scrollPageUp\nmap <c-o> goBack\nmap <c-i> goForward\nunmap f\nmap ff LinkHints.activateMode\nmap ;1 previousTab\nmap ;2 nextTab",
+  "linkHintCharacters": "sadfjklewcmpgh",
+  "linkHintNumbers": "0123456789",
+  "newTabUrl": "about:newtab",
+  "nextPatterns": "next,more,newer,>,›,→,»,≫,>>",
+  "previousPatterns": "prev,previous,back,older,<,‹,←,«,≪,<<",
+  "regexFindMode": true,
+  "ignoreKeyboardLayout": false,
+  "scrollStepSize": 60,
+  "smoothScroll": true,
+  "grabBackFocus": true,
+  "searchEngines": "w: https://www.wikipedia.org/w/index.php?title=Special:Search&search=%s Wikipedia\n\n# More examples.\n#\n# (Vimium supports search completion Wikipedia, as\n# above, and for these.)\n#\n# g: https://www.google.com/search?q=%s Google\n# l: https://www.google.com/search?q=%s&btnI I'm feeling lucky...\n# y: https://www.youtube.com/results?search_query=%s Youtube\n# gm: https://www.google.com/maps?q=%s Google maps\n# b: https://www.bing.com/search?q=%s Bing\n# d: https://duckduckgo.com/?q=%s DuckDuckGo\n# az: https://www.amazon.com/s/?field-keywords=%s Amazon\n# qw: https://www.qwant.com/?q=%s Qwant",
+  "searchUrl": "https://duckduckgo.com/?q=",
+  "userDefinedLinkHintCss": "div > .vimiumHintMarker {\n/* linkhint boxes */\nbackground: -webkit-gradient(linear, left top, left bottom, color-stop(0%,#FFF785),\n  color-stop(100%,#FFC542));\nborder: 1px solid #E3BE23;\n}\n\ndiv > .vimiumHintMarker span {\n/* linkhint text */\ncolor: black;\nfont-weight: bold;\nfont-size: 12px;\n}\n\ndiv > .vimiumHintMarker > .matchingCharacter {\n}"
+}