Firefox 117+ is working again in Win7 https://github.com/i486/VxKex https://github.com/vxiiduu/VxKex
CSS Calendar - 140 Win11 (Jul 15, 2025)
📥 CSS (115 Win7)⠀📥 CSS (132 Win11)⠀📥 CSS (119 Win11)⠀📥 CSS (109)⠀📥 Themes⠀📥 Autohotkey v1.1 ⬇️
android - 📥 desktop mode as default + fullscreen
F1 - Library window (History) CTRL+SHIFT+H
F2 - Find Previous (searchbar)
F3 - Find Next (searchbar) - works without script
Home - New Tab
END - Close Tab
PgUp - Go one Tab to Right
PgDn - Go one Tab to Left
INS - Focus Address bar
Del (hold) - copy URL. Activate bottom Notepad++, keywait CTRL+V and activate bottom Firefox is disabled
prefs.js file) copy into your Firefox profile (about:profiles). If you don't want to modify web content, just delete userContent.css file. If you want to return removed buttons/icons and some other small things, just delete upper "Delete me" part in userChrome.css file and all except first 5 lines in user.js file (CSS 132+ / ESR+)
Firefox installers can be extracted by WinRar/7-Zip and then used without installation. Profiles can be manually created and run via firefox.exe -p
or automatically created (if it doesn't already exist) and run via (example) firefox.exe -profile "a:\000"
Most of colors I've changed are pink (FF00A3 and E20074) and orange (FB7914) - they can be easily found/replaced. CSS files can be edited and tested even by your pet = data loaded from it are only temporary in RAM memory and after deleting files there is no trace of them in profile or Firefox itself
🚫disabling notifications and downloading updates - create updates file in C:\ProgramData\Mozilla or C:\ProgramData\MozillaXXX. Or deny access (NTFS Permissions Tools). However, these methods may cause a bug in Thunderbird (inability to open settings and browse emails)
🚫disabling compatibility check of profile - delete compatibility.ini file and create compatibility.ini folder. Profile may or may not be damaged, but its use will no longer be decided by someone else
To view images in full size (2560x1080) you can save page as Web page, complete (7MB)
132 (2024) - 1-LINE - 
115-esr (2023-2025) - 1-LINE - 
132 (2024) - 2-LINE - 
132 (2024) - DEFAULT - 
119 (2023) - 3-LINE - 1080p 
119 (2023) - DEFAULT - 
119 (2023) - DEFAULT - 
119 (2023) - 3-LINE - 
/* IMPORTANT - find ".findbar-find-previous" (userChrome.css) and change "padding-left" number - example
.findbar-find-previous {padding-left: 213px!important;}
Works in FF 109/119 */
.browserContainer > findbar {-moz-box-ordinal-group: 0!important;order: -1 !important;}
.browserContainer > findbar {max-width: 700px!important;margin-top: -25px!important;} /* if web content jumps when pressing CTRL+F, the number needs to be adjusted */
.findbar-highlight, .findbar-case-sensitive, .findbar-match-diacritics, .findbar-entire-word {max-width: 10%!important;font-size: 10px !important;margin: 0px!important;margin-top: -2px!important;}
.findbar-find-status {max-width: 2000px!important;}
.findbar-label.findbar-find-status {margin-left: -100px!important;max-width: 20%!important;font-size: 10px !important;}
.findbar-find-status[status="notfound"] {margin-left: 0px!important;font-size: 13px !important;}
.findbar-container {scrollbar-width: none!important;}
.findbar-textbox {position: fixed!important;margin-top: -4px!important;} /* position of textbox */
119 (2023) - Pink - opened tabs, orange - bookmarks, without color - history. "width" (userChrome.css *06) and "browser.urlbar.maxRichResults" (about:config or user.js) - 150% DPI
119 (2023) - DEFAULT - opened tabs+bookmarks+history - 150% DPI
109 (2023) - 3-LINE - 150% system DPI
109 (2023) - 2-LINE - folder+context menu - 150% DPI
109 (2023) - 2-LINE - places.xhtml. Dark space - The best dynamic theme - 150% DPI
119 (2023) - 2-LINE - 
119 (2023) - DEFAULT - 
109 (2023) - 2-LINE - 
109 (2023) - DEFAULT - 
99 (2022) - 2-LINE 
99 (2022) - DEFAULT 
89 (2021) - 2-LINE 
89 (2021) - DEFAULT 
79 (2020) - 2-LINE 
79 (2020) - DEFAULT 
69 (2019) - 2-LINE 
69 (2019) - DEFAULT 
59 (2018) - 2-LINE 
59 (2018) - DEFAULT 
49 (2016) - 2-LINE 
49 (2016) - DEFAULT 
39 (2015) - 2-LINE 
39 (2015) - DEFAULT 
29 (2014) - 2-LINE 
29 (2014) - DEFAULT 
19 (2013) - 2-LINE 
19 (2013) - DEFAULT 
9 (2011) - 2-LINE 
9 (2011) - DEFAULT 
3.5 (2009-2011) - 2-LINE 
3.5 (2009-2011) - DEFAULT 
2 (2006-2008) - 2-LINE 
2 (2006-2008) - DEFAULT 
89 - Gen0 (2021-12) 150% DPI
99 - Gen0+ (2023-01) 150% DPI
Customization (userChrome.css)
Useful addons
Enhancer for YouTube https://addons.mozilla.org/en-US/firefox/addon/enhancer-for-youtube/
YouTube Ad Auto-skipper https://addons.mozilla.org/en-US/firefox/addon/youtube-ad-auto-skipper/
Hide YouTube Fullscreen Controls https://addons.mozilla.org/en-US/firefox/addon/hide-youtube-controls/
SaveFrom.net helper https://addons.mozilla.org/en-US/firefox/addon/savefromnet-helper/
I don't care about cookies https://addons.mozilla.org/en-US/firefox/addon/i-dont-care-about-cookies/
Disable HTML5 Autoplay https://addons.mozilla.org/en-US/firefox/addon/disable-autoplay/
Image Video Block https://addons.mozilla.org/en-US/firefox/addon/image-video-block/
Large Image Blocker https://addons.mozilla.org/en-US/firefox/addon/large-image-blocker/
Load Background Tabs Lazily https://addons.mozilla.org/en-US/firefox/addon/load-background-tabs-lazily/
Print Edit WE https://addons.mozilla.org/en-US/firefox/addon/print-edit-we/
Save Page WE https://addons.mozilla.org/en-US/firefox/addon/save-page-we/
Firefox Color https://addons.mozilla.org/en-US/firefox/addon/firefox-color/
User-Agent Switcher https://addons.mozilla.org/en-US/firefox/addon/uaswitcher/
https://github.com/topics/firefox?l=css&o=desc&s=stars
https://github.com/search?q=firefox+language%3ACSS&type=repositories&l=CSS&s=stars&o=desc
https://firefoxcss-store.github.io/
https://www.reddit.com/r/FirefoxCSS/
https://www.userchrome.org/
about:about
about:downloads
chrome://browser/content/places/places.xhtml
https://firefox-source-docs.mozilla.org/devtools-user/browser_toolbox/index.html
https://support.mozilla.org/en-US/kb/keyboard-shortcuts-perform-firefox-tasks-quickly
https://www.mozilla.org/en-US/firefox/releases/
https://whattrainisitnow.com/calendar/
https://ftp.mozilla.org/pub/firefox/releases/
https://ftp.mozilla.org/pub/devedition/releases/
https://ftp.mozilla.org/pub/fenix/releases/
https://caniuse.com/
https://www.deviceinfo.me/
https://explore.whatismybrowser.com/useragents/explore/software_name/firefox/
https://html5test.com/
https://georgebastock.github.io/CSS-Animation-Test/
https://www.w3schools.com/css/css3_transitions.asp
https://www.w3schools.com/css/css3_shadows.asp
about:config
dpi
layout.css.devPixelsPerPx
turning off full screen warning
full-screen-api.warning.timeout;0
default zooming of PDF files
pdfjs.defaultZoomValue;page-width
find in page - colors
ui.textSelectBackgroundAttention
ui.textHighlightBackground
ui.textHighlightForeground
new tab - color
browser.display.background_color;#eeeeee
scrollbars
widget.non-native-theme.scrollbar.size
widget.non-native-theme.win.scrollbar.use-system-size
widget.non-native-theme.scrollbar.size.override
widget.disable-dark-scrollbar
widget.non-native-theme.win11.scrollbar.force-overlay-style
widget.windows.overlay-scrollbars.enabled
disabling tooltips when hovering over bookmarks
browser.chrome.toolbar_tips
disable animations (interface of program and website itself) - probably no need to be afraid of blindly toggling "animat" and "transition" preferences
browser.fullscreen.animate;false
browser.tabs.animate;false
image.animation_mode;none
ui.prefersReducedMotion;1
svg.disabled;true
full-screen-api.transition-duration.leave
full-screen-api.transition-duration.enter
a compact density option will be added to "customize toolbar" menu
browser.compactmode.show
set compact density immediately by number 1
browser.uidensity
disable graphical user interface "Proton"
browser.proton.enabled
address bar - number of items
browser.urlbar.maxRichResults
address bar - disable autoFill
browser.urlbar.autoFill;false
address bar - disable search engine
keyword.enabled;false
address bar - disable "Firefox suggest"
browser.urlbar.groupLabels.enabled;false
address bar - disable faded font
browser.urlbar.formatting.enabled;false
address bar - hide reader icon
reader.parse-on-load.enabled;false
tabs - disable previews when dragging
nglayout.enable_drag_images;false
tabs - minimum width
browser.tabs.tabMinWidth
tabs pinned - disable autoreload
browser.sessionstore.restore_pinned_tabs_on_demand
disable request to delete settings when browser is not started for a long time
browser.disableResetPrompt;true
disable query to enable DRM
browser.eme.ui.enabled;false
slow Firefox startup - turn off notifications
browser.slowStartup.notificationDisabled
do not turn off firefox when closing last tab
browser.tabs.closeWindowWithLastTab;false
open in tabs only
browser.link.open_newwindow.restriction;0
location query
geo.enabled
disable "insecure login" warning
security.insecure_field_warning.contextual.enabled;false
ctrl+shift+j
devtools.chrome.enabled;true
disable autoplay
media.autoplay.enabled;false
media.autoplay.allow-muted;false
disable enforcement of signing add-ons
xpinstall.signatures.required;false
disable blacklisting of add-ons
extensions.blocklist.enabled;false
not to allow arbitrary banning of add-ons
extensions.legacy.enabled;true
do not save list of currently opened tabs to disk = reduce writing to SSD
browser.sessionstore.resume_from_crash;false
do not create bookmarks backups
browser.bookmarks.max_backups;0
disabling automatic page refresh
accessibility.blockautorefresh;true
maximum cache size on SSD
browser.cache.disk.capacity
maximum size of cached file on SSD
browser.cache.disk.max_entry_size
cache isolation
browser.cache.cache_isolation;true
connection timeout
network.http.connection-timeout
firefox.exe - priority "normal"
dom.ipc.processPriorityManager.enabled;false
limiting number of firefox.exe processes
fission
dom.ipc.processCount
FPS limiter
layout.frame_rate
reduce "Page Referrer" (from which webpage link was opened)
network.http.referer.disallowCrossSiteRelaxingDefault, true
disable "Page Referrer". May broke some websites (steamdb.info)
network.http.sendRefererHeader, 0
pretending different FF version or OS - example
general.useragent.override, Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:126.0) Gecko/20100101 Firefox/126.0/Yirxwl2yEK2v8lv4
show hidden addons in about:debugging
devtools.aboutdebugging.showHiddenAddons
disable PDF
pdfjs.disabled
acceleration, media support
layers.acceleration
dxva
media.hardware-video
media.wmf.dxva.d3d9.amd-pre-uvd4.disabled
ffvpx
opus
flac
ogg
wav
wmf
mp4
264
webm
vp9
av1
image blocker
permissions.default.image;2
may fix broken youtube
network.http.http3.enable;false
may fix non-functional addons
extensions.manifestV3.enabled; false
suggestions for improvements
-remove titles/checkboxes in "find in page" bar and replace them with buttons/icons
-show all downloads in pop-up window (with scrollbar) and get rid of "show all downloads" window
-renaming bookmarks directly (long/short right mouse click)
-tabs with play/pause button and hotkey (replace useless volume button)
-combine "Edit Folder/Bookmark" in context menu into a single entry at one specific position (properties in FF79-)
-popup status bar around mouse cursor
-add-ons in "Customize Toolbar" menu
-decrease mouse vert sensitivity when cursor approaches left/right sides of bookmarks (folders)
-custom colours of folders for quick orientation (bookmarks)
-javaScript CPU/GPU resource limiter (rotating ad can use entire CPU core regardless of its frequency)
-remove items from address bar (long/short right mouse click)
-in places.xhtml show paths to items (searching)
-custom tabs color (by domain)
-hide https://www. in address bar
-separate audio/video cache from normal cache. What's the point of current setup where important cache data is overwritten by useless video that also reduces SSD lifetime? Constantly modifying NTFS permissions for cache folder is not very comfortable...
-remove 3 dots+empty right space in bookmarks names (if are too long) + width limit - FF109+ (userChrome.css)
#PlacesToolbarItems > toolbarbutton > menupopup {max-width: 85%!important;}
toolbarbutton.bookmark-item > menupopup > menu > menupopup {max-width: 85%!important;}
:is(label, description)[value][crop]::before {text-overflow: unset!important;}
menuitem.bookmark-item > label {margin-right: -10%!important;}
.sidebar-placesTree {margin-right: -20px!important;}
toolbarbutton menupopup[placespopup] > :is(menu, menuitem) :is(.menu-text) {margin-top: 0 !important;margin-left: 0 !important;margin-bottom: 0 !important;}
-places.xhtml - horizontal bottom part - FF109+ (userContent.css)
/* places.xhtml */
#editBMPanel_namePicker {width: 40%!important;}
#editBMPanel_locationField {width: 60%!important;}
#detailsPane {margin-bottom: -162px!important;padding: 0px!important;background-color: #FB7914!important}
#editBookmarkPanelContent {display: flex!important;}
#placesToolbar {padding-top: 0px!important;padding-bottom: 0px!important;}
menupopup > menuitem,menupopup > menu {padding-block: unset!important;}
hbox.editBMPanel_tagsRow {display: none!important;}
label.editBMPanel_tagsRow {display: none!important;}
#tags-field-info {display: none!important;}
label.editBMPanel_keywordRow {display: none!important;}
#editBMPanel_keywordField {display: none!important;}
#keyword-field-info {display: none!important;}
label.editBMPanel_nameRow {display: none!important;}
label.editBMPanel_locationRow {display: none!important;}