hi FF experts
i have noticed that all the icons of my FF Add-ons (Extensions, Themes, and Plugins) have a *red exclamation mark* at the left-lower corner when i open the window from Tools/Add-ons. what does the exclamation mark mean? see the attached screenshot please.
because of the early version of FF that i am still using?
FYI - i do *not* want to upgrade my FF due to performance and compatibility considerations (mainly for the add-ons i use). i tried the latest version before and it was slow and crashed.