Downgrade firefox using .deb file
Downgrade firefox using .deb file System: Ubuntu 14.04.5 Problems: I use firefox version 47 for a screenshot solution using selenium in python. After a system update, the firefox updated to latest version 48 (2016, Aug, 02), and raises a error: WebDriverException: Message: Requested size exceeds screen size There is a discussion about talking this bug here . Solution: Before he new bug -fix version is available, I decide to first down grade it to version 47. Steps: 1. sudo apt-get purge firefox sudo apt-get autoremove This first will remove firefox, and the second will move all the dependencies that is not used anymore. I got this recommended by ubuntu after run the first cmd. List the autoremoved packages below, in case any dependency is missed from other cmd : The following packages were automatically installed and are no longer required: acl at-spi2-core colord dconf-gsettings-backend dconf-service fontconfig fontconfig-config fonts-dejavu-core hicolo