Pesticide for Chrome
Extension Delisted
This extension is no longer available in the official store. Delisted on 2025-09-17.
This extension inserts the Pesticide CSS into the current page, outlining each element to better see placement on the page.
In this version the banner at the bottom is off by default. To turn it on hold the control key. Be sure that you've "clicked" into the window otherwise the browser won't be able to tell that you're typing (that's just how browsers work).
** If you want to use this extension on local files (when the URL says file:// at the beginning) you need to go into your Chrome extension settings, go to the Details for the Pesticide for Chrome extension, and turn on the setting "Allow access to file URLs". This is a security setting from Chrome that is off by default.
Pesticide is an open source CSS tool created by Adam Morse and available for download, forking on Github at https://github.com/mrmrs/pesticide
Latest reviews
2020 i still use this
Esta extensión esta colando publicidad. Sutilmente abre una página de Ali express si el usuario no esta activamente usando el navegador. Es una lastima verdaderamente ya que es la mejor extensión de este tipo que he usado, pero he tenido que desinstalarla por esta razón.
Great one, helps a lot while learning HTML and css
It does the job very well, but this version does collect user information. From the readme.md inside the extension: "By using this extension, you agree to allowing us to sell datasets including GEO country, DAU (daily active users), MAU (monthly active users) to 3p companies while maintaining user anonymity." That might include IP addresses, I'm not sure. Anyway, the end decision is up to you. I won't be using this particular version.
It used to work great. Now it needs permission to read and change data on googleapis.com. Why?
Simple, yet works like kitten :)
This used to be a good extension, and by all accounts the github code is still safe. However, this packaged extension now regularly loads ads. If you inspect the extension as it is running, it regularly makes requests to https://www.serverapi12.com/api/v1/cmps which then returns some rather spammy urls that it will occasionally open.
Love it
It works perfectly. For anyone who's having issues, you need to go to Manage extensions, allow the access to all urls and then press ctrl (or command, if you're on a Mac) and click the icon of the extension :)
The hover feature is not working on the new edge browser.
doesn't work. I hold down ctrl key nothing was happening
thank u
not working
Nice
Extremely useful and simple to use. Thank you!
Very helpful! This extension can be used for local pages as well. Once you download the extension, go to Manage Extensions and enable the Allow access to file URLs.
NOT WORKING IN MY PC
Not working on Linux (arch and ubuntu) Has anyone been able to make it working?
not working, watching a tutorial of css and whe professor uses it perfectly however it doesn't work on my laptop
If you can't use it, go to Configuration -> More Tools -> Extensions -> Details -> Allow acces to file URL, and that's it you can use it
doesn't work. I thought it was my machine until i looked in the reviews and saw others had the same problem
it is not working
Nie waże ile razy wyczyszcze cache itd pesticide nie zadziala, żałość i tyle
Amazing app!! Simply beautiful <3
Couldn't get it to work
This extension is really hit or miss for me. When it works, it's SUPER helpful. I wish it had never worked so I wouldn't be so upset when it won't. Holding down control on my Mac works for most pages but it won't work for my local files even though I have enabled that setting. I can't find any support for this extension either. If someone from Pesticide sees this, I need help!
I thought this extension wasn't working until I normal clicked on the extension's icon in the Chrome Menu (as opposed to right-clicking and looking for options in there that is). Holding the control key did nothing (it didn't show the banner at the bottom).
You could add an option to change color of div borders, on blue theme based website, its hard to see those lines
LOVE this extension. I am a front end engineer and use this all the time!
DOes not works
Can't see what you're hovering on reddit.
Love this tiny extension, I use it constantly for checking alignment and positioning of DOM elements!
I hope this extension can use shortcut to active it and more custom options such as switch for show or not show the shadow when hover to a box
Awesome Extension: PLEASE READ TIP NOTE: You must go into the extension settings and allow pesticide to access local files otherwise it won't work until it is hosted somewhere. I had to track down the developer to figure it out. Hope this helps.
Not working for local html files opened in chrome.
If you can't use this tool on Local HTML Files then you have to give permission called "Allow access to file URLs" to this extension . To do that, 1) Right click on Pesticide icon on top-right corner. 2) Click on Manage Extensions. 3) Now scroll down until you see an option called "Allow access to file URLs" and toggle it to turn it on. That's it! Now you can use this extension on Local HTML Files.
Would be nice if "file URLs" was on by default.
This doesn't work at all.
Excellent extension. Found out the reason for an anoying hidden overflow-x element within seconds of installation. Still works in 2019!
its not working
Love it but wish that when you hovered over a box it would give you the dimensions.
La mejor extensión para un desarrollador web
i am a newbie here to practice csss. It works fine with online pages. but when i open files from local, it does not work! why?
it is not work on my chrome brower
If you're inspecting pages on your local machine make sure to "Allow access to file URLs" in Chrome's Manage Extensions
Super useful! Thanks much!
Hi Paul, There is a way to make it work on local pages as well?
Doesn't even work in my chrome . I am using windows 7
