Firefox does not remember window size if you care about privacy
I have a problem that I have already found threads that list both the issue and the fix, but they are pretty ludicrous.
If you care about privacy and security and enable the about:config privacy.resistFingerprinting option, Firefox then refuses to remember window size and position between startups.
So rather than block Firefoxes SENDING of window position during fingerprinting attempts, they just turn off the ability for it to store window size and positions entirely. This is idiotic and almost seems to be malicious to the point of trying to aggravate users into not taking their privacy seriously. It is either malicious in an attempt to aggravate you into not worrying about your privacy or lazy programming, one of the two.
Should this be reported as a bug or what even though it seems to be functioning as intended, however idiotic that may be.
When features are blocked for privacy sake, the features and functionality themselves should never be disabled. Only refusing to send the data back out when fingerprint requests happen.
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That is how "Resist Fingerprinting" works. You get screen dimension rounded to the nearest 200x100. You are also moved to the UTC timezone and other settings are restricted.
More info: