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On a certain website the window size has become so huge I cannot use certain features and am unable to reduce the window size myself. It went huge as I was moving the cursor and I have been unable to ajust this. How do I alter screen size manually?

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Sometimes when moving the cursor the window size on certain sites reduces or increases. This happens randomly and I am not able to make it happen to change the size of the screen to my choice. The window on a particular site is now so huge I am unable to use features on there as they do not come into view on my window at all. Please help me on how to control this feature or in other words how do I increase or decrease the window size manually.

Sometimes when moving the cursor the window size on certain sites reduces or increases. This happens randomly and I am not able to make it happen to change the size of the screen to my choice. The window on a particular site is now so huge I am unable to use features on there as they do not come into view on my window at all. Please help me on how to control this feature or in other words how do I increase or decrease the window size manually.

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See "Resizing oversize window" - MozillaZine Knowledge Base

There are a couple of extensions tat could also be involved


Please mark "Solved" one answer that will best help others with a similar problem -- hope this was it.

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Reset the page zoom on pages that cause problems: View > Zoom > Reset (Ctrl+0 (zero); Cmd+0 on Mac)