Internet connection slow after few minutes.

[killer bee]

When i surfing internet after few minutes left some web sites get too much times for load, they're loading loading loading. This problem mainly happen for Firefox. Chrome not like that. So what is the issue? I think its not that web site issue because of i can visit that web sites easily by using Firefox but some times Chrome also slow down in some web sites.
Thanks!

 

[killer bee]

Please help me guys! Now this is gonna more serious. Now i can use only Opera web browser. All other web browsers no longer work for me.

 

[Roderunner]

Check your router has ISP settings for MTU (Maximum Transfer Units)

 

[stve]

Now i can use only Opera web browser. All other web browsers no longer work for me.

Why would anyone be worried so long as Opera is there to save the day.

Try disabling any extensions or add-ons you are using with Firefox & Chrome.
If that doesn't help maybe reinstalling Firefox will