here is the run down of this problem and how to fix it over and over and over its not really fix its a work around... first things first Version 129.0.2 64bit problem is on both linux and windows 10/11 problem is the same on both having addons installed does not seems to matter as it seems this a problem with firefox it self and devs have bin ignoring it for a long time it seems so what happens open a page open in new tab or just following a link (google or other search engine etc) page loads fully select text and right click to open context menu copy is greyed out and does not work work around switch tab and just switch back right click to open context menu copy it not greyed out anymore and can now be used this happens at 100% rate works around always works but that is not a fix to this problem Note's ctrl+c works but context menu copy still show's greyed out problems seems to happen even on a clean install of firefox windows or linux and to test it even more i just reinstalled windows and arch linux on my laptop (it need a good clean up) so there was not last over date in appdata or program data on windows and the same on linux nothing was save there was no account logged in to sync data/settings just to check if im not going insane here i installed chorme load the same page's copy on context menu always works and to end my post i use arch btw (i'm sorry i had to)