Opened 3 years ago

Last modified 3 years ago

#22506 needs_information defect

Tor Browser 7.0 dalayed startup with certain addons (with filter lists)

Reported by: morbis55 Owned by: tbb-team
Priority: Medium Milestone:
Component: Applications/Tor Browser Version:
Severity: Normal Keywords:
Cc: mcs Actual Points:
Parent ID: Points:
Reviewer: Sponsor:


How to reproduce:

  • Use the latest unofficial Tor Browser (same result for version 7.0a3, 7.04a, 7.0-build1 and 7.0)
  • It will launch just fine without problems
  • Go to "Get Add-ons" and just as an example install "uBlock Origin"
  • After it installed you will see the browser get extremely laggy and freeze for some seconds
  • Restart the browser and see how it will take abnormally long to start

The reason are the filter lists of the addon
If you disable the filters, the problem is gone
(does not make any sense with a filter list based blocker however, so not a solution)
This also goes for all other addons with filter lists like:
uMatrix, Ghostery, Adblock Plus, ... etc

In previous versions of Tor Browser there is also a small delay
but not even far as drastically as it is with Tor Browser 7.0
Also it is not a problem with original Firefox 52ESR itself as the problem does not occure there.
Thus it must be a Problem with Tor Browser 7.0

Child Tickets

Change History (4)

comment:1 Changed 3 years ago by morbis55

Summary: Torbrowser 7.0 dalayed startup with certain addons (with filter lists)Tor Browser 7.0 dalayed startup with certain addons (with filter lists)

comment:2 Changed 3 years ago by mcs

Cc: mcs added

Thanks for opening this ticket. What OS are you using?

What is your security slider setting, and does changing it make any difference?

Is the slowness noticeable only during startup or does the browser remain slow while you use it?

comment:3 Changed 3 years ago by gk

Status: newneeds_information

FWIW, I tested this on a 64bit Linux system by installing ublock Origin in a clean Tor Browser 7.0 and I did not notice any lag/slowdown. Neither during surfing, nor during start-up.

comment:4 Changed 3 years ago by acid

I have the same issue. Reproducible every time when installing uBlock or updating it.
Sometimes also during startup, I guess this is when uBlock is trying to update lists.

Arch Linux x64
TB v7.0.11
uBlock Origin v1.14.22

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