FF cant load pages properly or dont load them at all

Question

First of all hi to everybody and tnx for your help this is may first post here and i hope you guys can help me. So i was happy Firefox user for few years now and it was perfect but then few weeks ago weird things started happening (if my memory is correct few days after update to 25.0). So pages started to load more slow but nothing terrible in most cases, but some times they wont load at all, then when i enter url in adress bar sometimes it just spins in tab for like half a sec and then nothing like i newer pressed enter after pressing enter like 10 times page will finally load, and there is more sometimes instead of page i will get random text some times it wil be html or html with few page elements and sometimes it is something that looks like a monkey punched a keyboard with his head, when i google form ff stat page most of the times it will just do nothing spin for half sec and nothing, also youtube omg youtube is so broken most thumbnails are missing and ones i see are somehow tared apart like bottom half and top half are not alined (something like when fps is to high in games) and when i try to play videos some times they work the first time but mostly they just show first frame and stop or first few secs and stop or jut show green mess in youtube player and stop also flash player crashes some times and comments dont load at all. And few more things but this is already long so i stop i think you get the idea. I Tried reinstalling FF 4 times with out any plugins it is still the same i also deleted all remaining ff folders that i could find so i think it was clean reinstall i also reinstalled and updated flash to newest version also nothing. Only thing i can think of is that i have Thunderbird also installed ans seance mozila makes both of them that mby they share some files and bug survives reinstalls with Thunderbird is that possible. And everything works fine with chrome and IE and on tablet on same wireless network. Plz help me fix this i love FF and relay dont wanna change it but this is making net unusable for me. Also i have nod32 and zone alarm and they say i am virus free. I can post screenshot of plugins i had installed when it all started happening but i dont know how if it helps just tell me how and i will also i think list of my current plugins is in data that ff collected but i had more before reinstalls.

Answer 1

If images are missing then check that you aren't blocking images from some domains.
*Press the F10 key or tap the Alt key to bring up the hidden "Menu Bar" temporarily.
*Check the permissions for the domain in the currently selected tab in "Tools > Page Info > Permissions"
*Check "Tools > Page Info > Media" for blocked images
*Select the first image link and use the cursor Down key to scroll through the list.
*If an image in the list is grayed and "<i>Block Images from...</i>" has a check-mark then remove this check-mark to unblock images from this domain.
Make sure that you do not block (third-party) images, the permissions.default.image pref on the <b>about:config</b> page should be 1.
Make sure that you haven't enabled a High Contrast theme in the Windows/Mac Accessibility settings.
Make sure that you allow pages to choose their own colors.
*Tools > Options > Content : Fonts & Colors > Colors : [X] "Allow pages to choose their own colors, instead of my selections above"
Note that these settings affect background images.
See also:
*http://kb.mozillazine.org/Website_colors_are_wrong
There are extensions like Adblock Plus (Firefox/Tools > Add-ons > Extensions) and security software (firewall, anti-virus) that can block images and other content.
See also:
*https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes
*http://kb.mozillazine.org/Images_or_animations_do_not_load
*http://kb.mozillazine.org/Websites_look_wrong