I use Slimjet as my browser and had a problem similar to yours. I suspected an add-on was the problem. Except when I went to the add-on screen in Slimjet there were none. I knew this was BS as I had active add-ons that were working fine.
Long story short, I backed up all my bookmarks. Made a list of the add-ons I wanted. Downloaded a new copy of Slimjet, recovered my bookmarks from the backup. Visited different sites to reinstall the add-ons I wanted. Problem solved.
Take a look at your brower’s add-on page. If you have add-ons and they aren’t listed you might have the same problem.
I saw your post on Slimjet - checked it out & downloaded it. It seems to be Chrome but faster and a MUCH less memory hog.
Can you import your bookmarks from Chrome?
Thanks!