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kantravikantkantravikant 

Error: <apex:page> is required and must be the outermost tag in the markup at line 1 column 1

User-added image
when editing the vf page in firefox.
while is ok when editing in chrome
i.e. able to remove readOnly="true" from below code
<apex:page standardController="loan__Loan_Account__c" showHeader="false" sidebar="false" readOnly="true">
    <apex:relatedList list="Cases__r"  />
</apex:page>

The weird one.
Sonam_SFDCSonam_SFDC
Weird indeed, I tried on my FF browser with the same code - works for me..

Can you try doing the same for ay other saved VF page on FF..
kantravikantkantravikant
Thanks Sonam_SFDC !
I think there is some problem with my FF, as same error is occuring for all vf pages.