Before "pocket" was integrated into the browser as a core component, it was available as an extension.its harmless and I just simply removed it from the toolbar
At that time, you may have read skidoo saying "it's a wonderful extension, check it out".
In the "version" of pocket which wound up being shipped as an integrated (non-removable) browser component,
functionality has been severely castrated compared to the original.
Hello? The "muh just removed it from duh toolbar" feelgood approach still leaves the component pre-loaded (in memory) at each firefox launch.
Maybe visiting about:config and (whack-a-mole, find all 6 relevant prefkeys?) "disabling" will lighten the memory footprint at next startup. Maybe. Oh, and remember to revisit about:config and recheck those prefkeys (cuz they may wind up reverted following an update... and bear in mind that -- thanks to A/B testing -- your neighbor will think you're crazy if you mention that aggravating result, because his install is tagged "B" vs your "A").
Cumulatively, all the crapola components which have been shoehorned into our "web browser" are not "harmless".
Unwanted, uninvited, cannot be removed, bloats the memory footprint of the application, adds vulnerability vectors...