Firefox won't go online, error message "Offline Mode"

I guess you are using (crappy) firefox. Firefox has a MASSIVE hangup with network manager whereby if the wireless isn't connected it moans. If you install another browser, is it ok?

If it isn't I know exactly what it is (DNS) otherwise if you still want to use firefox there is an about:config hack to make it not care.

Whats the meaning of "(crappy) firefox"? About the DNS, do I have to assign that from the router?

In short, I hate firefox. You should get dns from the router but sometimes it needs to be manually deined for whatever reason. Things aren't working so we need to take extra steps.

Do you think the network (router) blocked firefox from accessing to the Internet?

No its the firefox hangup. Have you tried the other browser yet? The router will not block the app if its a generic home grade router. Also check the browser isn't in offline mode under the file menu.

I have tried unchecking the offline mode but still doesn't work. What else can I do?

The problem is probably that NetworkManager is telling firefox that one network card is not in use, and thus the computer is "offline". Its a bad state of affairs, but until somone fixes it. you can do this:

load firefox
in the address bar type "about:config"

accept the warnings, then type "Toolkit.networkmanager.disable" in the bar. Click (double click?) the value to set it to false.

http://kb.mozillazine.org/Toolkit.networkmanager.disable

Did you try a different browser?

My apologies, the correct value is "true" not "false"

When I typed into the address bar: about:config it led me to "Here be dragons" and then it has got a button saying "I'll be careful, I promise"

What do I do next?

How do I install a different web browser?

>What do I do next?

Once you click on the button labelled "ill be careful", a new window should appear. There is a text box labelled filter. In that box type "Toolkit.networkmanager.disable" (or cut and paste, whatever is easiest).

This should leave exactly one option below it, with the name "Toolkit.networkmanager.disable". If the value is "false", double click it to set it to true. Once you do this, select file -> work offline to go back online.

If this does not solve the problem, then something else is at fault.

I have just tried the above you have mentioned but still didn't solve my issue. What else could it be the fault?

I am unsure. You can try a different browser, as suggested above. Use the software center to install chromium, ephiphany or konqueror.

Another option is to try installing this extention under firefox:
https://addons.mozilla.org/en-US/firefox/addon/13152/

Are you sure those are not games? Those 3 that I just found is games.

At the moment, I am using windows to communicate with you. Firefox won't get me online so I won't be able to download.

Sorry, there is also a game called chromium. The browser is "chromium-browser".

re ....'How do I install a different web browser?'....

take a look at

https://wiki.edubuntu.org/IceCat

see if this browser helps.

sudo add-apt-repository ppa:chromium-daily/ppa; sudo apt-get update; sudo apt-get -y install chromium-browser

or in firefox access the usual about:config page
make a boolean item named: browser.offline
set it to false
Then make a new boolean value named: toolkit.networkmanager.disable
set it to false
restart the browser