What theme are you using?

Start your Computer in safe mode with networking. Then start Firefox. Try Safe web sites. Is the problem still there?

Starting The Computer In Safe Mode;
Free Online Encyclopedia

Did you try to open a new window?

Create a new profile as a test to check if your current profile is causing the problem.

See "Creating a profile":

• https://support.mozilla.org/kb/profile-manager-create-and-remove-firefox-profiles
• http://kb.mozillazine.org/Standard_diagnostic_-_Firefox#Profile_issues

If the new profile works then you can transfer files from a previously used profile to the new profile, but be cautious not to copy corrupted files to avoid carrying over problems.

• http://kb.mozillazine.org/Transferring_data_to_a_new_profile_-_Firefox

@FredMcD this a Linux computer so Safe Mode is something it doesn't have.

@cor-el Thanks! I created a new profile and started copying files over, checking for the error to reappear after each copy. The culprit was places.sqlite. So at the end I don't even need the new profile, I've just deleted places.sqlite from the old one and it got regenerated empty and my problem is gone.

The interesting thing about places.sqlite is that it had grown 83,9MB over the times and quite some time ago Firefox has stopped remembering places (and the address bar broke down a few days ago). Is this perfectly normal, or shall I eventually file a bug?

muranyia said

@FredMcD this a Linux computer so Safe Mode is something it doesn't have.

The link I posted is: http://encyclopedia2.thefreedictionary.com/Linux+Safe+Mode

If this should happen again, these can help;

These add-ons can be a great help by backing up and restoring Firefox

FEBE (Firefox Environment Backup Extension) {web link} FEBE allows you to quickly and easily backup your Firefox extensions, history, passwords, and more. In fact, it goes beyond just backing up -- It will actually rebuild your saved files individually into installable .xpi files. It will also make backup of files that you choose.

OPIE {web link} Import/Export extension preferences

FredMcD said

muranyia said

@FredMcD this a Linux computer so Safe Mode is something it doesn't have.

The link I posted is: http://encyclopedia2.thefreedictionary.com/Linux+Safe+Mode

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He knows just as said there is not really a safe mode like you may be familiar with as Windows user.

James said

FredMcD said

muranyia said

@FredMcD this a Linux computer so Safe Mode is something it doesn't have.

The link I posted is: http://encyclopedia2.thefreedictionary.com/Linux+Safe+Mode

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He knows just as said there is not really a safe mode like you may be familiar with as Windows user.

In Linux "Safe Mode" (lower Runlevels) typically there is no GUI. http://encyclopedia2.thefreedictionary.com/runlevel Thanks anyway!