User Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:44.0) Gecko/20100101 Firefox/44.0 Build ID: 20160126223146 Steps to reproduce: * Case A firefox --profile <TEST_DIR> and in TEST_DIR I use the following for prefs.js: user_pref("permissions.default.image", 2); user_pref("lala.lala", "lala"); * Case B After firefox was launched with the above steps, I manually did change the preference from about:config Actual results: * Case A Firefox launched and was loading pages with their images. * Case B The pages that we loading their images no longer did. What happened in Case B was expected, what happened in Case A wasn't. Expected results: I would expect Firefox to load pages without loading images. When searching for this firefox preference, I run into several places that mention permissions.default.image as a "frozen" setting. However, I wouldn't find any documentation of this. From these ,  I understand the the preference removal occurred only for the UI?  http://stackoverflow.com/questions/31571726/cant-turn-off-images-in-selenium-firefox/31572457#31572457  https://bugzilla.mozilla.org/show_bug.cgi?id=851701  https://bugzilla.mozilla.org/show_bug.cgi?id=851698
Component: Untriaged → Image Blocking
Product: Firefox → Core
Both of these (case A and case B) work fine for me - hate to ask the obvious, but there wasn't a typo in there somewhere, was there? Manually editing prefs.js is a dangerous thing, but it does work for me.
Created attachment 8722404 [details] about-config-lala.png When I launch firefox as described in the "Steps to reproduce" I can see the fake "lala.lala" preference the prefs.js has
Created attachment 8722406 [details] about-config-permissions.default.image.png When I launch firefox as described in the "Steps to reproduce" I can see the "permissions.default.image" preference. To ensure there is not a typo, I copied from the pref.js, and pasted in the search box of the about:config page. permissions.default.image remains with value 1. I think that in this way we can eliminate the typo, as a factor in this case?
Let me clarify a bit Case A of "Steps to reproduce": $ rm -rf test-profile $ mkdir test-profile $ cat > test-profile/prefs.js user_pref("permissions.default.image", 2); user_pref("lala.lala", "lala"); # check no firefox is running $ pgrep -fla firefox $ firefox --profile test-profile/ & Firefox then opens with two tabs showing a blue page titled "More protection" (promo for the Private Browsing) and a 2nd tab Ubuntu's start page. Then I start visiting pages or about:config. Also some more details on my system: I am on Xubuntu 14.04 $ uname -a Linux xxxxxx 3.13.0-45-generic #74-Ubuntu SMP Tue Jan 13 19:36:28 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux $ lsb_release -a No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 14.04.3 LTS Release: 14.04 Codename: trusty
Yeah, you're going off the supported path here. What if you create a new profile through firefox --profile, then edit prefs.js in it? Also, with your approach, what happens the second time you start firefox with the same profile?
Didn't know this is not a proper way of launching the profile :( I tried as you suggested a) launch with an empty profile b) close c) then manually add in pref.js d) launch again. It works fine . This started as an effort to reproduce a problem that is usual in some selenium/webdriver cases , and the usual answer is that this setting is frozen. I tried to reproduce this, and it worked. But it seems my reproduction (as well as the original problem?) originates from a badly structured pref.js, and/or entire profile? So, you suggest using a "default" profile (the one after steps a) & b) mentioned above), and then tweaking this further? Is there somewhere a minimal profile I could use to tweak mine further?  a) $ rm -rf test-profile/ $ mkdir test-profile/ $ pgrep -fla firefox $ firefox --profile test-profile/ & b) # close firefox, profile should now be written on disk c) $ vim test-profile/prefs.js $ grep permissions.default.image test-profile/prefs.js user_pref("permissions.default.image", 2); $ head -n20 test-profile/prefs.js # Mozilla User Preferences /* Do not edit this file. * * If you make changes to this file while the application is running, * the changes will be overwritten when the application exits. * * To make a manual change to preferences, you can visit the URL about:config */ user_pref("permissions.default.image", 2); user_pref("app.update.lastUpdateTime.browser-cleanup-thumbnails", 0); user_pref("app.update.lastUpdateTime.xpi-signature-verification", 0); user_pref("browser.bookmarks.restore_default_bookmarks", false); user_pref("browser.cache.disk.capacity", 1048576); user_pref("browser.cache.disk.filesystem_reported", 1); user_pref("browser.cache.disk.smart_size.first_run", false); user_pref("browser.cache.frecency_experiment", 2); user_pref("browser.download.importedFromSqlite", true); user_pref("browser.migration.version", 34); user_pref("browser.newtabpage.enhanced", true); d) $ firefox --profile test-profile/ & # in the about:config permission is set to the proper value, and pages load without images.  https://github.com/gempesaw/Selenium-Remote-Driver/issues/248#issuecomment-175849005 http://stackoverflow.com/questions/25214473/disable-images-in-selenium-python http://stackoverflow.com/questions/31571726/cant-turn-off-images-in-selenium-firefox
You shouldn't even need to edit pref.js, just adding a user.js file to the profile directory with your user-overriden values should suffice. You can create a profile without starting Firefox via the -CreateProfile command-line option: https://developer.mozilla.org/docs/Mozilla/Command_Line_Options#User_Profile There is also mozprofile, a python program to automate some of these tasks that you may find useful: https://dxr.mozilla.org/mozilla-central/source/testing/mozbase/docs/mozprofile.rst I don't know much about that, but the automation team should be able to help with it.
11 months ago
Priority: -- → P3
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