UI of Firefox is slow by typing or selecting the text (after update 33.0)

After the 33.0 update, I noticed that typing a backspace in any area on a Web page or even in the Firefox address bar is slow to echo, on a lag of 1 second. Also, by selecting the text typed (to remove a TI, etc.) by a click-and - drag quick selects the entire, but when I click in the dialog box to deselect, the part which has not been posted as selected initially, is selected for a moment before the string whole hilite selection disappears.

What makes the browser very cumbersome to use.

This seems to be new to 33.0. I tried to reset Firefox, but it does not solve the problem. No problem in IE 11.0, so I do not think that the malware. I have also to keep all s/w and run avast/zonealarm for safety. I've never had an infection of malicious software on this machine. Win7 Home Premium 64-bit, 8 GB of RAM. The use of resources is low, so not out of process control.

I have request the latest Microsoft "Patch Tuesday" updates 15/10, the same day that I updated to Firefox. This can complicate the diagnosis. But even once, IE was not affected, then, how the different Firefox UI for basic keyboard/screen I/O?

If there is an easy way to "downgrade" to the 32.0.3 prior revision, I could try to confirm. Help, please!

Start Firefox in Safe Mode to check if one of the extensions (Firefox/tools > Modules > Extensions) or if hardware acceleration is the cause of the problem.

  • Put yourself in the DEFAULT theme: Firefox/tools > Modules > appearance
  • Do NOT click on the reset button on the startup window Mode safe

You can check for problems with the sessionstore.js and sessionstore.bak files in the profile folder of Firefox that store session data.

Delete sessionstore.js will cause App Tabs and groups of tabs open and closed tabs (back) to get lost and you will have to re-create them (take note or bookmarks if possible).

Tags: Firefox

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