I have successfully copied my entire Firefox settings numerous times in numerous distros. I now have Firefox running exactly the same on 3 computers -- same Bookmarks, Start page, and stored logins, +++.
In Home folder, do Ctrl-h to show the hidden files. One will be named .mozilla, with Firefox as a sub-folder. Copy the Firefox folder onto a thumb drive or other media. Then Paste that Firefox folder into another computer. That should give you everything. If that doesn't work, try copying and pasting the entire .mozilla folder.
Notes: This may be unnecessary, but I have always first run Firefox without the copied folder, so that the folder is created by Mozilla. I do recall that in Win7, the Firefox folder was a sub-sub-sub folder under Programs, I think, and it had a bunch of digits at the end, I believe. I deleted those numbers when I copied it, and it worked for me. I also copied the entire Firefox to the last partitions of my hard drives, for if needed ever.
In Home folder, do Ctrl-h to show the hidden files. One will be named .mozilla, with Firefox as a sub-folder. Copy the Firefox folder onto a thumb drive or other media. Then Paste that Firefox folder into another computer. That should give you everything. If that doesn't work, try copying and pasting the entire .mozilla folder.
Notes: This may be unnecessary, but I have always first run Firefox without the copied folder, so that the folder is created by Mozilla. I do recall that in Win7, the Firefox folder was a sub-sub-sub folder under Programs, I think, and it had a bunch of digits at the end, I believe. I deleted those numbers when I copied it, and it worked for me. I also copied the entire Firefox to the last partitions of my hard drives, for if needed ever.