When I usually end up bookmarking all my open tabs after 3 months, they are often above 1000 tabs ... and this both at work and at home. Seems some of my coworkers suffer from the same ailment but with less pronounced symptoms.

Is it serious, Doctor?

By the way, in Firefox, if you end up pinning too much tabs you are left with very few space to manage your regular tabs ... and there is no scroll buttons for pinned tabs. I should maybe fill a bug one day.