Remove unwanted whitespace in Vim

From: http://vim.wikia.com/wiki/Remove_unwanted_spaces

In a search, \s finds whitespace (a space or a tab), and \+ finds one or more occurrences.

Delete all trailing whitespace (at the end of each line) with: Edit

:%s/\s\+$//

Like with ed(1), the substitution text can be omitted if blank:

:%s/\s\+$

More rarely, a user might want to delete (leading) whitespace at the beginning of each line:

:%s/^\s\+
" Same thing (:le = :left = left-align given range):
:%le

With the following mapping a user can press F5 to delete all trailing whitespace. The variable _s is used to save and restore the last search pattern register (so next time the user presses n they will continue their last search), and :nohl is used to switch off search highlighting (so trailing spaces will not be highlighted while the user types). The e flag is used in the substitute command so no error is shown if trailing whitespace is not found. Unlike before, the substitution text must be specified in order to use the required flag.

:nnoremap <silent> <F5> :let _s=@/<Bar>:%s/\s\+$//e<Bar>:let @/=_s<Bar>:nohl<CR>

See Highlighting whitespaces at end of line to display, rather than delete, unwanted whitespace.

how to solve the issue of SPNEGO authentication is not supported on this client for firefox

http://www-01.ibm.com/support/knowledgecenter/SS7K4U_8.5.5/com.ibm.websphere.nd.doc/ae/tsec_SPNEGO_configweb_new.html

Complete the following steps to ensure that your Firefox browser is enabled to perform SPNEGO authentication.

1. At the desktop, log in to the windows active directory domain.
2. Activate Firefox.
3. At the address field, type about:config.
4. In the Filter, type network.n
5. Double click on network.negotiate-auth.trusted-uris. This preference lists the sites that are permitted to engage in SPNEGO Authentication with the browser. Enter a comma-delimited list of trusted domains or URLs.
   Note: You must set the value for network.negotiate-auth.trusted-uris.
6. If the deployed SPNEGO solution is using the advanced Kerberos feature of Credential Delegation double click on network.negotiate-auth.delegation-uris. This preference lists the sites for which the browser may delegate user authorization to the server. Enter a comma-delimited list of trusted domains or URLs.
7. Click OK. The configuration appears as updated.
8. Restart your Firefox browser to activate this configuration.

how to solve iframe not loading in firefox using https

if you are trying to add this Iframe on a SSL-encrypted website (https://), it won’t work any more since Firefox 23 because Mozilla has decided to blocked all unencrypted content on encrypted websites (for example http-iframes on https-websites). You can change this behaviour in your own Firefox installation by typing about:config in the address bar and setting security.mixed_content.block_active_content to false.