Until last Friday when i opened Firefox on my PC (Windows 10) i had the bookmarks sidebar on the left hand side as i "pinned" it there with the ''view>sidebar>bookmarks" function but now every time i open Firefox the sidebar is gone and i have to add it every single time which is very time consuming and annoying, could you please help? Basically now every time i open a new window i have to go to "view>sidebar>bookmarks" to see my bookmarks sidebar or click on the "show sidebars" icon on the menu bar, this never happened before as the bookmarks sidebar was always displayed and pinned in every new window (as i would like it to be!), please advise, thank you!