A lot of people are saying that they're seeing ads for an alleged Tumblr Store. Please enjoy this guide (using Android in this example, but Apple versions are available) to get the most of it:-
Go to the App Store or Play Store and search "Firefox"
Select Firefox Fast & Private Browser from this list
Install Firefox and when it's done, click "Open"
In the newly opened browser, search for "Mozilla Extensions", then select the link that appears.
On this page, search for "adblock" (the results are shown underneath). You may find that you get a prompt for your device of choice. If this happens, click it to be redirected to the extensions built for your phone.
Choose any of the extensions that you like by clicking on them, then on the following page, click "Add to Firefox".
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You should now have successfully installed an adblock to your mobile browser! You will no longer see ads on any of the websites you use, including YouTube, Facebook, Instagram or any of anime/cartoon/movie sites we've all turned to since streaming turned out to be a crock of shit. This will also give you an enhanced Tumblr experience too, meaning you will not need to purchase their ad-free experience (Tumblr get paid by advertisers regardless, so this website isn't going anywhere).
So what next? Well, if you make a Firefox account (it's free), you can migrate all of your bookmarks and history from another browser, then uninstall that browser. Plus you get synchronisation between platforms, meaning links and websites seen or open on your phone can be viewed simultaneously on your laptop! This applies to your shiny new extensions too!
Speaking of extensions, why not download some more? There's the YouTube enhancer with better playback controls. Or that Facebook blocker, that stops Facebook tracking you through other websites. Or there are even tab controls! Consolidate all of your current tabs into one, label it, then compress them. Then come back later and open them back into their former versions. An excellent way to keep all your studying materials in one place! Or maybe add some themes. There are several thousand to choose from. And you can also make them yourself using Firefox's own desktop browser!
Ultimately the choice is yours. I hope this guide has been useful for you. And if not, reblog it anyway because it might be useful for somebodye else.