My popup blocker exceptions disappear when I close Firefox.
I just ran into this the other day, but it's become a major issue. The exceptions I enter into the popup blocker don't persist from session to session; as long as at least one instance of Firefox remains open the exception list is there, but after I close Firefox and reopen it I have no exceptions left. I only need a handful of exceptions, but I don't want to have to type them in every time I access those web sites!
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In case you are using "Clear history when Firefox closes":
- do not clear the Site Preferences
- Tools > Options > Privacy > Firefox will: "Use custom settings for history": [X] "Clear history when Firefox closes" > Settings
- https://support.mozilla.org/kb/Clear+Recent+History
Note that clearing "Site Preferences" clears all exceptions for cookies, images, pop-up windows, software installation, passwords, and other website specific data.
Start Firefox in Safe Mode to check if one of the extensions (Firefox/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance).
- Do NOT click the Reset button on the Safe Mode start window.
- https://support.mozilla.org/kb/Safe+Mode
- https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes
If you use cleanup software like CCleaner then check the settings for the Firefox application.