browser

How do I start Firefox or Thunderbird when it is stating that my 'profile is in use'?

With Netscape:

rm $HOME/.netscape/lock or rm ~/.netscape/lock

For Mozilla:

rm $HOME/.mozilla/*/*/lock or rm ~/.mozilla/*/*/lock

For Firefox:

rm $HOME/.mozilla/firefox/*/lock rm $HOME/.mozilla/firefox/*/.parentlock or rm ~/.mozilla...

In Adobe Acrobat or acroread, when I click on a link in a PDF file I get the error: 'Web Browser has not been specified. Do you want to configure the Weblink Preferences?'

This error mean that the application does not know what your web browser is. This is preventing the application from opening up the html document.

To fix this error you can do either of the following:

When the question comes up, click on Yes.
In...

When I click on a link in Thunderbird, I get the error: 'Error: The browser specified in Preferences ->Preferred Applications does not exist'

First, quit Thunderbird (or else any changes you make to the file below will be overwritten)
Add the following line to your prefs.js file in your .thunderbird directory:

user_pref(''network.protocol-handler.app.http'', ''/usr/bin/firefox'');

For...