In previous versions of FF, I would have several bookmarks within a single folder and there would be several such folders within a main folder called "Groups" on the bookmark toolbar. Left clicking on Groups would show a list of folders containing bookmarks. Right clicking on one of these folders would then allow for "Open all in tabs." The bookmarks would then open in separate tabs following the order as listed within the selected folder. However, with the advent of FF57, no matter how I have the bookmarks within a folder sorted (A-Z, Z-A, etc,) the tabs always are now opening in the reverse order: First bookmark becomes last bookmark, second bookmark becomes next to last bookmark, and so on. All addons are FF57 compatible; and below here's screenshot of my addons. BTW, this reversal of tabs once happened to me with the previous FF version. Never got a solution, but after I manually reversed the bookmarks' order, within a couple of days, things got back to normal all by themselves. That is, the manually reversed order all of a sudden stopped reversing. I then went back to the original order and tabs were no longer reversed when selecting "open all tabs."