Mozilla Firefox like other competing browsers, can understood various kind of network protocols for example, FTP, HTTP, RSTP etc. But if the protocol setting of Firefox is either disturbed or malfunctioned, it may have trouble understanding the protocol you’re requesting. The protocol setting of Firefox could be affected due to harmful content inside cookies or cache, thrown by the websites you visit. Additionally, the add-ons you use could also change the protocol settings. Recently, I came around following error while using Firefox, even with HTTP addresses:
The address wasn’t understood
You might need to install other software to open this address.
After receiving this error, the first thing I did was restarting Firefox, but no change in the situation. Secondly, clearing cookies and cache too didn’t helped in my case. At last, I tried to change the advance protocol handling settings, and this finally fixed the problem. Hence, I am sharing the cure to this issue, with you guys:
FIX : “The Address Wasn’t Understood” Error In Mozilla Firefox
1. Open Mozilla Firefox window, type about:config in the URL bar and hit Enter key. Click I’ll be careful, I promise! option now.
You can now close Firefox and restart it, the problem should be fixed on the go.
Hope this helps. Do checkout about:config tricks for Firefox!