I've updated the end of the OP:
Block unencrypted content on encrypted sites with adblockplus.Steps to produce:Step 1: -- Click on AblockPlus icon, Click filter preferences.
Step 2: -- Click Custom Filters Tab.
Step 3: -- Click add filter group., name it Blocking HTTP Content on HTTPS Enabled Sites
Step 4: -- Click Add Filter.
Step 5: -- Add for example, for bitcointalk.org, add
|http://*$domain=bitcointalk.org
Step 6: -- For other sites that use https, like google.com, add
|http://*$domain=google.com
Note: Just replace the domain name with the one you prefer. E.G. |http://*$domain=
example.comTo force HTTP to HTTPS.Step 1: Install Noscript addon.
Step 2: Click Noscript icon, click options, click advance tab, under advance tab is https tab, click https tab, under https tab is a behavior tab, click it.
Step 3: Drop the menu down to
Forbid active web content unless it becomes from a secure (HTTPS) connections
to Never.
Step 4: Add the domain name you prefer to
Force the following sites to use secure (HTTPS) connections
Window.
Note: Example: google.com youtube.com
www.youtube.com 
