When FF is already open, why does a link from an email, for example, open a new FF window and NOT a Tab ?
With FF already open and in use, and I click a link to the internet it open a FF window - why not a "tab" inside the already open FF ?
ప్రత్యుత్తరాలన్నీ (1)
Firefox might be using another profile.
You can open the about:profiles page via the location bar to check whether multiple profiles are present and what profile Firefox currently is using.
- Do NOT click any Remove button on this page.
- https://support.mozilla.org/en-US/kb/profile-manager-create-and-remove-firefox-profiles
Firefox 67 and later can use a dedicated profile for each of the Firefox update channels and will lock the profile, so it can only be used by Firefox in a specific installation folder. For Release versions this profile would be a xxxxxxxx.default-release profile, profiles used in older Firefox versions usually used a xxxxxxxx.default profile (a refresh adds a time stamp).