

It might be different during beta testing but it is generally recommended to figure out other ways of coping with a problem. It is therefor usually not a good idea to download and install an old version. This is done to protect users from downloading outdated, insecure or unstable versions of a software. The official website that provide downloads of Firefox and Thunderbird only offer the latest version of the programs for all supported operating systems. The situation was that he switched to Thunderbird 3 beta 3 and noticed that some of the add-ons that he had installed were not working anymore. A Ghacks reader recently posted a comment asking whether it is possible to download old releases of Thunderbird.
