When Im in and I open a G Suite file (either double-click or select & press enter) in Firefox it opens in a new window whereas in Chrome it opens in a new tab. Since modifier keys are supported, the menu item text should change when the modifiers are pressed or released. This might be a duplicate of How to open Google Drive files in new window but that question is 5 years old and unanswered. Since the menus persist after the button is released, there could be another context menu for the context menu items, but that might be even weirder than modifier keys on context menu items. That's basically adding a preference, and giving every menu an item which indicates the state of that preference and allows you to change it. There could also be a submenu at the top named something like 'menu items open new tabs', with submenu items to change that to this tab or new window.

Better segregation might make it less of a problem to have similar items like 'open image in this tab' and 'open image in new tab' Hold down shift when selecting Open image in new tab from the context menu to invert the default tab active behaviour. It looks to me like my context menus have a lot of items that aren't as context-sensitive as they could be - in particular, many items appear regardless of where the click is, so the menu is longer on a link or image than on a blank part of the page.

Firefox open image in new tab