After i enter a website it appears a security question when i say for it to allow the webpage appears out of normal, what to do?

when i'm entenring a page like facebook the security question appears, i press ad exception and then the page appears nothing like normal, it apears like someone copyed every text and put in Word.

That sounds strange. Are you sure it's the correct site?
When you have a problem with one particular site, a good "first thing to try" is clearing your Firefox cache and deleting your saved cookies for the site.
(1) Bypass Firefox's Cache
Use Ctrl+Shift+r to reload the page fresh from the server.
Alternately, you also can clear Firefox's cache completely using:
orange Firefox button (or Tools menu) > Options > Advanced
On the Network mini-tab > Cached Web Content : "Clear Now"
If you have a large hard drive, this might take a few minutes.
(2) Remove the site's cookies (save any pending work first). While viewing a page on the site:
* right-click and choose View Page Info > Security > "View Cookies"
* Alt+t (open the classic Tools menu) > Page Info > Security > "View Cookies"
That will open a dialog where you can remove the cookies individually.
Then try reloading the page. Does that help?

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