Unable to save files in Firefox, /tmp has become read-only after upgrade

Unable to save files in Firefox, /tmp has become read-only after upgrade

I recently upgraded to 18.04, and found out that when I tried to save files in Firefox I got an error saying that the could not be saved, because the disc, folder, or file is write-protected. Write-enable the disc and try again, or try saving in a different location After doing some digging I discovered that tmp had become read-only since the upgrade. Is there anything I can do I tried the answers outlined here, but none of them worked. Output of ls -ld tmp : drwxrwxrwt 21 root root 69632 Apr 28 12:10 tmp Output of mount grep tmp: udev on dev type devtmpfs rw,nosuid,relatime,size3993816k,nr_inodes998454,mode755 tmpfs on run type tmpfs rw,nosuid,noexec,relatime,size804648k,mode755 tmpfs on devshm type tmpfs rw,nosuid,nodev tmpfs on runlock type tmpfs rw,nosuid,nodev,noexec,relatime,size5120k tmpfs on sysfscgroup type tmpfs ro,nosuid,nodev,noexec,mode755 tmpfs on runuser128 type tmpfs rw,nosuid,nodev,relatime,size804644k,mode700,uid128,gid142 tmpfs on runuser1000 type tmpfs rw,nosuid,nodev,relatime,size804644k,mode700,uid1000,gid1000 Output of df tmp: Filesystem 1K-blocks Used Available Use Mounted on devsda5 25087084 17130836 6658840 73