When I try to open Gmail on Firefox with MetaMask add-on enabled it gets stuck on the loading screen:
But when I disable MetaMask add-on and refresh Firefox page, Gmail is loading.
I have tried it on several different machines before creating this issue.
Hi @macrosaga, thank you for sharing this. Can you please submit a ticket to our support team regarding this issue at https://support.metamask.io/ and click Start a Conversation. A live chat box window will then automatically appear on your screen where you may contact the support team. MetaMask support WILL NEVER ask you to verify your Secret Recovery Phrase.
another solution would be just change/add another browser
edge, brave and opera will do
another solution would be just change/add another browser
edge, brave and opera will do
That’s not a solution my friend.
Hi @macrosaga thank you so much for the details, just to confirm, did you contact the MetaMask team following the @Coffee7643 instructions above? in case not, please ensure you are using the latest version of the MetaMask extension, according to the info received the issue was solved 
