u/scorvus99

I'm so fucking tired of opening the context menu and reading it like an ancient scroll, searching for the right function among two dozen options, even though I don't use 70% of them. So, I customized the context menu for myself and am sharing it with you.
/* CLEAN FIREFOX CONTEXT MENU 
   Works on Version 152.0.3
   ============================================================
   INSTRUCTIONS FOR INSTALLATION
   ============================================================
   1. Open Firefox and type in the address bar: about:config
   2. Click "Accept the Risk and Continue"
   3. Search for: toolkit.legacyUserProfileCustomizations.stylesheets
   4. Set the value to true (double-click on the line)
   5. Close about:config
   6. Open your Firefox profile folder:
      - Type in address bar: about:support
      - In "Application Basics" section, find "Profile Folder"
      - Click "Open Folder" (or "Open Directory")
   7. In the profile folder, create a folder named "chrome" (if it doesn't exist)
   8. In the chrome folder, create a file named "userChrome.css" (if it doesn't exist)
   9. Open the userChrome.css file in a text editor (Notepad, Notepad++, etc.)
   10. Copy ALL of this code and paste it into the userChrome.css file
   11. Save the file
   12. Restart Firefox (completely close and reopen)

   ADDITIONAL SETTINGS (optional):
   - Disable Container Tabs: about:preferences → Tabs and browsing → Uncheck "Use Container Tabs"
   - Disable Split View: about:config → browser.tabs.splitView.enabled = false
   - Disable Copy Clean Link: about:config → privacy.query_stripping.strip_on_share.enabled = false
   - Disable Google Lens Search: about:config → browser.search.visualSearch.featureGate = false

   IMPORTANT: After Firefox updates, some element IDs may change.
   ============================================================ */

/* Tab audio button */
.tab-audio-button { display: none !important; }

/* ============================================================
   TAB CONTEXT MENU
   ============================================================ */

/* New Tab to the Right (C) */
#context_newTabFromTab { display: none !important; }

/* Add Tab to New Group */
#context_addToNewGroup,
#context_moveTabToNewGroup,
#context_moveTabToGroup,
#context_ungroupTab + menuseparator { display: none !important; }

/* Add Split View */
#context_moveSplitViewToNewGroup { display: none !important; }

/* Share */
#tabContextMenu .share-tab-url-item { display: none !important; }

/* Reload Tab */
#context_reloadTab { display: none !important; }

/* Unload Tab (Discard) */
#context_unloadTab { display: none !important; }

/* Duplicate Tab */
#context_duplicateTab { display: none !important; }

/* Bookmark Tab... */
#context_bookmarkTab { display: none !important; }

/* Move Tab */
#context_moveTabOptions { display: none !important; }

/* Send Tab to Device (Share) */
#context_sendTabToDevice,
#context_sendTabToDevice_separator,
#context_sendTabToDevicePopupMenu,
#context-sendlinktodevice,
#context-sendpagetodevice,
shareTabURL,
#context-sep-sendpagetodevice { display: none !important; }

/* Open in New Container Tab */
#context_openTabInContainer,
#context-openlinkinusercontext-menu { display: none !important; }

/* Select All Tabs */
#context_selectAllTabs { display: none !important; }

/* Close Tab */
#context_closeTab { display: none !important; }

/* Undo Close Tab (Reopen Closed Tab) */
#context_undoCloseTab { display: none !important; }

/* Close Duplicate Tabs (G) */
#context_closeDuplicateTabs { display: none !important; }

/* ============================================================
   PAGE CONTEXT MENU
   ============================================================ */

/* Save to Pocket */
#context-pocket,
#context-savelinktopocket,
#context-sep-pocket { display: none !important; }

/* Select All */
#context-selectall,
#context-sep-selectall { display: none !important; }

/* Take Screenshot */
#context-takescreenshot,
#screenshots_mozilla_org_create-screenshot,
#context-take-screenshot { display: none !important; }

/* Send Image */
#context-sendimage,
#context-emailimage { display: none !important; }

/* Bookmark Link */
#context-bookmarklink { display: none !important; }

/* Translate */
#context-translate-selection,
#context-translatepage { display: none !important; }

/* Set as Desktop Background */
#context-setDesktopBackground,
#context-sep-setbackground { display: none !important; }

/* View Page Source */
#contex-viewpartialsource-selection,
#contex-sep-viewsource,
#context-sep-viewsource { display: none !important; }

/* Other separators */
#context-sep-navigation,
#context-sep-viewbgimage,
#inspect-separator,
#context-sep-copyimage,
#context-sep-undo,
#context-sep-paste,
#context-sep-properties,
#context-sep-bidi { display: none !important; }

/* ============================================================
   LINK AND IMAGE CONTEXT MENU
   ============================================================ */

/* Open Link in New Window */
#context-openlink,              /* Main ID for links */
#context-openlinknew,           /* Alternative */
#context-openlink + menuseparator { display: none !important; } /* Separator */

/* Open Link in New Private Window */
#context-openlinkprivate,       /* Main ID */
#context-openlinkprivate + menuseparator { display: none !important; } /* Separator */

/* Copy Clean Link (without tracking) (G) */
#context-copylink-no-tracking,  /* ID for link without tracking parameters */
#context-copylink-no-tracking + menuseparator { display: none !important; } /* Separator */

/* Search Image with Google Lens (U) */
#context-searchwithgooglelens,  /* Presumed ID (may differ) */
#context-searchwithgooglelens + menuseparator { display: none !important; } /* Separator */

/* Inspect Accessibility Properties */
#context-inspect-a11y,          /* Main ID */
#context-inspect-a11y + menuseparator { display: none !important; } /* Separator */

/* ============================================================
   UNIVERSAL METHODS FOR REMOVING SEPARATORS
   ============================================================ */

/* 1. The simplest and most reliable way: hide ALL separators in ALL menus */
menuseparator {
    display: none !important;
}

/* 2. More selective way: hide ALL separators ONLY in tab context menu */
#tabContextMenu menuseparator {
    display: none !important;
}

/* 3. Hide separators by their ID (for most standard separators) */
#context-sep-open,                /* Separator before "Open Link" */
#context-sep-navigation,          /* Separator for navigation */
#context-sep-viewbgimage,         /* Separator before "View Background Image" */
#context-sep-selectall,           /* Separator before "Select All" */
#context-sep-viewsource,          /* Separator before "View Page Source" */
#context-sep-sendpagetodevice,    /* Separator for "Send Page to Device" */
#context-sep-sendlinktodevice,    /* Separator for "Send Link to Device" */
#inspect-separator,               /* Separator before "Inspect Element" */
#context-sep-copyimage,           /* Separator in image menu */
#context-sep-paste,               /* Separator for "Paste" */
#context-sep-undo,                /* Separator for "Undo" */
#context-sep-properties,          /* Separator for "Properties" */
#context-sep-bidi {               /* Separator for text direction */
    display: none !important;
}

/* 4. Remove separator that follows a specific menu item (for precise customization) */
#context_openANewTab + menuseparator,        /* For "New Tab" item */
#context_toggleMuteTab + menuseparator,      /* For "Mute Tab" item */
#context_openTabInWindow + menuseparator,    /* For "Move to New Window" item */
#context_sendTabToDevice + menuseparator,    /* For "Send Tab to Device" item */
#context_closeOtherTabs + menuseparator,     /* For "Close Other Tabs" item */
#context_closeTab + menuseparator {          /* For "Close Tab" item */
    display: none !important;
}

/* ============================================================
   END OF SETTINGS
   ============================================================ */
I developed an extension for quick copy, save, image search and translation buttons on images.

Clean Firefox context menu
